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Macular Degeneration

Macular degeneration, or age-related macular degeneration (AMD), is a leading cause of vision loss in Americans 60 and older. It is a disease that destroys your sharp, central vision. You need central vision to see objects clearly and to do tasks such as reading and driving. AMD affects the macula, the part of the eye that allows you to see fine detail. It does not hurt, but it causes cells in the macula to die. There are two types: wet and dry. Wet AMD happens when abnormal blood vessels grow under the macula. These new blood vessels often leak blood and fluid. Wet AMD damages the macula quickly. Blurred vision is a common early symptom. Dry AMD happens when the light-sensitive cells in the macula slowly break down. Your gradually lose your central vision. A common early symptom is that straight lines appear crooked. Regular comprehensive eye exams can detect macular degeneration before the disease causes vision loss. Treatment can slow vision loss. It does not restore vision. NIH: National Eye Institute

Mad Cow Disease see Creutzfeldt-Jakob Disease

Creutzfeldt-Jakob disease (CJD) is a rare, degenerative brain disorder. Symptoms usually start around age 60. Memory problems, behavior changes, vision problems, and poor muscle coordination progress quickly to dementia, coma, and death. Most patients die within a year. The three main categories of CJD are Sporadic CJD, which occurs for no known reason Hereditary CJD, which runs in families Acquired CJD, which occurs from contact with infected tissue, usually during a medical procedure Cattle can get a disease related to CJD called bovine spongiform encephalopathy (BSE) or "mad cow disease." There is concern that people can get a variant of CJD from eating beef from an infected animal, but there is no direct proof to support this. NIH: National Institute of Neurological Disorders and Stroke

Magnesium see Minerals

Minerals are important for your body to stay healthy. Your body uses minerals for many different jobs, including keeping your bones, muscles, heart, and brain working properly. Minerals are also important for making enzymes and hormones. There are two kinds of minerals: macrominerals and trace minerals. You need larger amounts of macrominerals. They include calcium, phosphorus, magnesium, sodium, potassium, chloride and sulfur. You only need small amounts of trace minerals. They include iron, manganese, copper, iodine, zinc, cobalt, fluoride and selenium. Most people get the amount of minerals they need by eating a wide variety of foods. In some cases, your doctor may recommend a mineral supplement. People who have certain health problems or take some medicines may need to get less of one of the minerals. For example, people with chronic kidney disease need to limit foods that are high in potassium.

Magnetic Resonance Imaging see MRI Scans

Magnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside your body. Health care professionals use MRI scans to diagnose a variety of conditions, from torn ligaments to tumors. MRIs are very useful for examining the brain and spinal cord. During the scan, you lie on a table that slides inside a tunnel-shaped machine. Doing the scan can take a long time, and you must stay still. The scan is painless. The MRI machine makes a lot of noise. The technician may offer you earplugs. Before you get a scan, tell your doctor if you Are pregnant Have pieces of metal in your body. You might have metal in your body if you have a shrapnel or bullet injury or if you are a welder. Have metal or electronic devices in your body, such as a cardiac pacemaker or a metal artificial joint

Makeup see Cosmetics

Cosmetics are products you apply to your body to clean it, make it more attractive, or change the way it looks. They include Hair dyes Makeup Perfumes Skin-care creams Cosmetics that treat or prevent diseases are also drugs. Products such as dandruff shampoo, fluoride toothpaste, and antiperspirant deodorant are both cosmetics and drugs. A good way to tell if you're buying a cosmetic that is also a drug is to see if the first ingredient listed is an "active ingredient." The active ingredient is the chemical that makes the product effective. The manufacturer must have proof that it's safe for its intended use. Cosmetics can cause allergic reactions. The first sign is often red and irritated skin. Fragrances and preservatives are the most common causes of skin problems. To find out all the ingredients in a cosmetic you use, check the container. Manufacturers are required to list them. Labels such as "natural" and "hypoallergenic" have no official meaning. Companies can use them to mean whatever they want. Food and Drug Administration

Malabsorption Syndromes

Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods. Causes of malabsorption syndromes include Celiac disease Lactose intolerance Short bowel syndrome. This happens after surgery to remove half or more of the small intestine. You might need the surgery if you have a problem with the small intestine from a disease, injury, or birth defect. Whipple disease, a rare bacterial infection Genetic diseases Certain medicines Symptoms of different malabsorption syndromes can vary. They often include chronic diarrhea, abnormal stools, weight loss, and gas. Your doctor may use lab, imaging, or other tests to make a diagnosis. Treatment of malabsorption syndromes depends on the cause.

Malaria

Malaria is a serious disease caused by a parasite. You get it when an infected mosquito bites you. Malaria is a major cause of death worldwide, but it is almost wiped out in the United States. The disease is mostly a problem in developing countries with warm climates. If you travel to these countries, you are at risk. There are four different types of malaria caused by four related parasites. The most deadly type occurs in Africa south of the Sahara Desert. Malaria symptoms include chills, flu-like symptoms, fever, vomiting, diarrhea, and jaundice. A blood test can diagnose it. It can be life-threatening. However, you can treat malaria with drugs. The type of drug depends on which kind of malaria you have and where you were infected. Malaria can be prevented. When traveling to areas where malaria is found See your doctor for medicines that protect you Wear insect repellent with DEET Cover up Sleep under mosquito netting Centers for Disease Control and Prevention

Male Breast Cancer

Although breast cancer is much more common in women, men can get it too. It happens most often to men between the ages of 60 and 70. Breast lumps usually aren't cancer. However, most men with breast cancer have lumps. Other breast symptoms can include Dimpled or puckered skin A red, scaly nipple or skin Fluid discharge Risk factors for male breast cancer include exposure to radiation, a family history of breast cancer, and having high estrogen levels, which can happen with diseases like cirrhosis or Klinefelter's syndrome. Treatment for male breast cancer is usually a mastectomy, which is surgery to remove the breast. Other treatments include radiation, chemotherapy and/or hormone therapy. NIH: National Cancer Institute

Male Genital Disorders see Penis Disorders; Testicular Disorders

Problems with the penis can cause pain and affect a man's sexual function and fertility. Penis disorders include Erectile dysfunction - inability to get or keep an erection Priapism - a painful erection that does not go away Peyronie's disease - bending of the penis during an erection due to a hard lump called a plaque Balanitis - inflammation of the skin covering the head of the penis, most often in men and boys who have not been circumcised Penile cancer - a rare form of cancer, highly curable when caught early

Male Infertility

Infertility is a term doctors use if a man hasn't been able to get a woman pregnant after at least one year of trying. Causes of male infertility include Physical problems with the testicles Blockages in the ducts that carry sperm Hormone problems A history of high fevers or mumps Genetic disorders Lifestyle or environmental factors About a third of the time, infertility is because of a problem with the man. One third of the time, it is a problem with the woman. Sometimes no cause can be found. If you suspect you are infertile, see your doctor. There are tests that may tell if you have fertility problems. When it is possible to find the cause, treatments may include medicines, surgery, or assisted reproductive technology. Happily, many couples treated for infertility are able to have babies. NIH: National Institute of Child Health and Human Development

Male Menopause see Men's Health

Most men need to pay more attention to their health. Compared to women, men are more likely to Smoke and drink Make unhealthy or risky choices Put off regular checkups and medical care There are also health conditions that only affect men, such as prostate cancer and low testosterone. Many of the major health risks that men face - like colon cancer or heart disease - can be prevented and treated with early diagnosis. Screening tests can find diseases early, when they are easier to treat. It's important to get the screening tests you need.

Male Sterilization see Vasectomy

Vasectomy is a type of surgery that prevents a man from being able to get a woman pregnant. It is a permanent form of birth control. A vasectomy works by cutting the tubes that carry the sperm out of the testicles. The surgery usually takes no more than 30 minutes. Most men go home the same day. In most cases, recovery takes less than a week. Having a vasectomy does not affect your sex life. It takes about three months before it is effective. Your doctor will test your semen to make sure that there are no sperm in it. Vasectomies can sometimes be reversed, but not always. Having a vasectomy does not protect against sexually transmitted diseases, such as HIV/AIDS. Men who have had a vasectomy should still practice safe sex to avoid STDs. NIH: National Institute of Child Health and Human Development

Malignancy see Cancer

Cancer begins in your cells, which are the building blocks of your body. Normally, your body forms new cells as you need them, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor. Tumors can be benign or malignant. Benign tumors aren't cancer while malignant ones are. Cells from malignant tumors can invade nearby tissues. They can also break away and spread to other parts of the body. Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for where they start. For example, lung cancer starts in the lung, and breast cancer starts in the breast. The spread of cancer from one part of the body to another is called metastasis. Symptoms and treatment depend on the cancer type and how advanced it is. Most treatment plans may include surgery, radiation and/or chemotherapy. Some may involve hormone therapy, immunotherapy or other types of biologic therapy, or stem cell transplantation. NIH: National Cancer Institute

Malnutrition

Food provides the energy and nutrients you need to be healthy. If you don't get enough nutrients -- including proteins, carbohydrates, fats, vitamins, and minerals - you may suffer from malnutrition. Causes of malnutrition include: Lack of specific nutrients in your diet. Even the lack of one vitamin can lead to malnutrition. An unbalanced diet Certain medical problems, such as malabsorption syndromes and cancers Symptoms may include fatigue, dizziness, and weight loss. Or, you may have no symptoms. To diagnose the cause of the problem, your doctor may do blood tests and a nutritional assessment. Treatment may include replacing the missing nutrients and treating the underlying cause.

Mammaplasty see Breast Reconstruction

If you need a mastectomy, you have a choice about whether or not to have surgery to rebuild the shape of the breast. Instead of breast reconstruction, you could choose to wear a breast form that replaces the breast, wear padding inside your bra, or do nothing. All of these options have pros and cons. What is right for one woman may not be right for another. Breast reconstruction may be done at the same time as the mastectomy, or it may be done later on. If radiation therapy is part of the treatment plan, your doctor may suggest waiting until after radiation therapy. If you're thinking about breast reconstruction, talk to a plastic surgeon before the mastectomy, even if you plan to have your reconstruction later on. A surgeon can reconstruct the breast in many ways. Some women choose to have breast implants, which are filled with saline or silicone gel. Another method uses tissue taken from another part of your body. The plastic surgeon can take skin, muscle, and fat from your lower abdomen, back, or buttocks. The type of reconstruction that is best for you depends on your age, body type, and the type of cancer surgery that you had. A plastic surgeon can help you decide. NIH: National Cancer Institute

Mammography

A mammogram is an x-ray picture of the breast. It can be used to check for breast cancer in women who have no signs or symptoms of the disease. It can also be used if you have a lump or other sign of breast cancer. Screening mammography is the type of mammogram that checks you when you have no symptoms. It can help reduce the number of deaths from breast cancer among women ages 40 to 70. But it can also have drawbacks. Mammograms can sometimes find something that looks abnormal but isn't cancer. This leads to further testing and can cause you anxiety. Sometimes mammograms can miss cancer when it is there. It also exposes you to radiation. You should talk to your doctor about the benefits and drawbacks of mammograms. Together, you can decide when to start and how often to have a mammogram. Mammograms are also recommended for younger women who have symptoms of breast cancer or who have a high risk of the disease. When you have a mammogram, you stand in front of an x-ray machine. The person who takes the x-rays places your breast between two plastic plates. The plates press your breast and make it flat. This may be uncomfortable, but it helps get a clear picture. You should get a written report of your mammogram results within 30 days. NIH: National Cancer Institute

Man-Made Disasters see Biodefense and Bioterrorism; Chemical Emergencies; Radiation Emergencies

A bioterrorism attack is the deliberate release of viruses, bacteria, or other germs to cause illness or death. These germs are often found in nature. But they can sometimes be made more harmful by increasing their ability to cause disease, spread, or resist medical treatment. Biological agents spread through the air, water, or in food. Some can also spread from person to person. They can be very hard to detect. They don't cause illness for several hours or days. Scientists worry that anthrax, botulism, Ebola and other hemorrhagic fever viruses, plague, or smallpox could be used as biological agents. Biodefense uses medical measures to protect people against bioterrorism. This includes medicines and vaccinations. It also includes medical research and preparations to defend against bioterrorist attacks. Centers for Disease Control and Prevention

Managed Care

Managed care plans are a type of health insurance. They have contracts with health care providers and medical facilities to provide care for members at reduced costs. These providers make up the plan's network. How much of your care the plan will pay for depends on the network's rules. Plans that restrict your choices usually cost you less. If you want a flexible plan, it will probably cost more. There are three types of managed care plans: Health Maintenance Organizations (HMO) usually only pay for care within the network. You choose a primary care doctor who coordinates most of your care. Preferred Provider Organizations (PPO) usually pay more if you get care within the network. They still pay part of the cost if you go outside the network. Point of Service (POS) plans let you choose between an HMO or a PPO each time you need care.

Mandibular Disorders see Jaw Injuries and Disorders

Your jaw is a set of bones that holds your teeth. It consists of two main parts. The upper part is the maxilla. It doesn't move. The moveable lower part is called the mandible. You move it when you talk or chew. The two halves of the mandible meet at your chin. The joint where the mandible meets your skull is the temporomandibular joint. Jaw problems include Fractures Dislocations Temporomandibular joint dysfunction Osteonecrosis, which happens when your bones lose their blood supply Cancers Treatment of jaw problems depends on the cause.

Manic-Depressive Illness see Bipolar Disorder

Bipolar disorder is a serious mental illness. People who have it go through unusual mood changes. They go from very happy, "up," and active to very sad and hopeless, "down," and inactive, and then back again. They often have normal moods in between. The up feeling is called mania. The down feeling is depression. The causes of bipolar disorder aren't always clear. It runs in families. Abnormal brain structure and function may also play a role. Bipolar disorder often starts in a person's late teen or early adult years. But children and adults can have bipolar disorder too. The illness usually lasts a lifetime. If you think you may have it, tell your health care provider. A medical checkup can rule out other illnesses that might cause your mood changes. If not treated, bipolar disorder can lead to damaged relationships, poor job or school performance, and even suicide. However, there are effective treatments to control symptoms: medicine and talk therapy. A combination usually works best. NIH: National Institute of Mental Health

Maple Syrup Urine Disease see Genetic Brain Disorders

A genetic brain disorder is caused by a variation or a mutation in a gene. A variation is a different form of a gene. A mutation is a change in a gene. Genetic brain disorders affect the development and function of the brain. Some genetic brain disorders are due to random gene mutations or mutations caused by environmental exposure, such as cigarette smoke. Other disorders are inherited, which means that a mutated gene or group of genes is passed down through a family. They can also be due to a combination of both genetic changes and other outside factors. Some examples of genetic brain disorders include Leukodystrophies Phenylketonuria Tay-Sachs disease Wilson disease Many people with genetic brain disorders fail to produce enough of certain proteins that influence brain development and function. These brain disorders can cause serious problems that affect the nervous system. Some have treatments to control symptoms. Some are life-threatening.

Marfan Syndrome

Marfan syndrome is a disorder that affects connective tissue. Connective tissues are proteins that support skin, bones, blood vessels, and other organs. One of these proteins is fibrillin. A problem with the fibrillin gene causes Marfan syndrome. Marfan syndrome can be mild to severe, and the symptoms can vary. People with Marfan syndrome are often very tall, thin, and loose jointed. Most people with Marfan syndrome have heart and blood vessel problems, such as a weakness in the aorta or heart valves that leak. They may also have problems with their bones, eyes, skin, nervous system, and lungs. There is no single test to diagnose Marfan syndrome. Your doctor may use your medical history, family history, and a physical exam to diagnose it. Marfan syndrome has no cure, but treatments can help delay or prevent complications. Treatments include medicines, surgery, and other therapies. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Marijuana

Marijuana is a green, brown, or gray mix of dried, crumbled parts from the marijuana plant. It can be rolled up and smoked like a cigarette or cigar or smoked in a pipe. Sometimes people mix it in food or inhale it using a vaporizer. Marijuana can cause problems with memory, learning, and behavior. Smoking it can cause some of the same coughing and breathing problems as smoking cigarettes. Some people get addicted to marijuana after using it for a while. It is more likely to happen if they use marijuana every day, or started using it when they were teenagers. Some states have approved "medical marijuana" to ease symptoms of various health problems. The U.S. Food and Drug Administration (FDA) has not approved the marijuana plant as a medicine. However, there have been scientific studies of cannabinoids, the chemicals in marijuana. This has led to two FDA-approved medicines. They contain THC, the active ingredient in marijuana. They treat nausea caused by chemotherapy and increase appetite in patients who have severe weight loss from HIV/AIDS. Scientists are doing more research with marijuana and its ingredients to treat many diseases and conditions. NIH: National Institute on Drug Abuse

Mastectomy

A mastectomy is surgery to remove a breast or part of a breast. It is usually done to treat breast cancer. Types of breast surgery include Total (simple) mastectomy - removal of breast tissue and nipple Modified radical mastectomy - removal of the breast, most of the lymph nodes under the arm, and often the lining over the chest muscles Lumpectomy - surgery to remove the tumor and a small amount of normal tissue around it Which surgery you have depends on the stage of cancer, size of the tumor, size of the breast, and whether the lymph nodes are involved. Many women have breast reconstruction to rebuild the breast after a mastectomy. Sometimes mastectomy is done to prevent breast cancer. Only high-risk patients have this type of surgery. NIH: National Cancer Institute

Maternal Health see Postpartum Care; Prenatal Care

Taking home a new baby is one of the happiest times in a woman's life. But it also presents both physical and emotional challenges. Get as much rest as possible. You may find that all you can do is eat, sleep, and care for your baby. And that is perfectly okay. You will have spotting or bleeding, like a menstrual period, off and on for up to six weeks. You might also have swelling in your legs and feet, feel constipated, have menstrual-like cramping. Even if you are not breastfeeding, you can have milk leaking from your nipples, and your breasts might feel full, tender, or uncomfortable. Follow your doctor's instructions on how much activity, like climbing stairs or walking, you can do for the next few weeks. Doctors usually recommend that you abstain from sexual intercourse for four to six weeks after birth. In addition to physical changes, you may feel sad or have the "baby blues." If you are extremely sad or are unable to care for yourself or your baby, you might have a serious condition called postpartum depression. Dept. of Health and Human Services Office on Women's Health

Maxillary Disorders see Jaw Injuries and Disorders

Your jaw is a set of bones that holds your teeth. It consists of two main parts. The upper part is the maxilla. It doesn't move. The moveable lower part is called the mandible. You move it when you talk or chew. The two halves of the mandible meet at your chin. The joint where the mandible meets your skull is the temporomandibular joint. Jaw problems include Fractures Dislocations Temporomandibular joint dysfunction Osteonecrosis, which happens when your bones lose their blood supply Cancers Treatment of jaw problems depends on the cause.

MCI see Mild Cognitive Impairment

Some forgetfulness can be a normal part of aging. However, some people have more memory problems than other people their age. This condition is called mild cognitive impairment, or MCI. People with MCI can take care of themselves and do their normal activities. MCI memory problems may include Losing things often Forgetting to go to events and appointments Having more trouble coming up with words than other people of the same age Memory problems can also have other causes, including certain medicines and diseases that affect the blood vessels that supply the brain. Some of the problems brought on by these conditions can be managed or reversed. Your health care provider can do thinking, memory, and language tests to see if you have MCI. You may also need to see a specialist for more tests. Because MCI may be an early sign of Alzheimer's disease, it's really important to see your health care provider every 6 to 12 months. At this time, there is no proven drug treatment for MCI. Your health care provider can check to see if you have any changes in your memory or thinking skills over time. NIH: National Institute on Aging

MDMA see Club Drugs

Club drugs are group of psychoactive drugs. They act on the central nervous system and can cause changes in mood, awareness, and how you act. These drugs are often abused by young adults at all-night dance parties, dance clubs, and bars. They include Methylenedioxymethamphetamine (MDMA), also known as Ecstasy XTC, X, E, Adam, Molly, Hug Beans, and Love Drug Gamma-hydroxybutyrate (GHB), also known as G, Liquid Ecstasy, and Soap Ketamine, also known as Special K, K, Vitamin K, and Jet Rohypnol, also known as Roofies Methamphetamine, also known as Speed, Ice, Chalk, Meth, Crystal, Crank, and Glass Lysergic Acid Diethylamide (LSD), also known as Acid, Blotter, and Dots Some of these drugs are approved for certain medical uses. Other uses of these drugs are abuse. Club drugs are also sometimes used as "date rape" drugs, to make someone unable to say no to or fight back against sexual assault. Abusing these drugs can cause serious health problems and sometimes death. They are even more dangerous if you use them with alcohol. NIH: National Institute on Drug Abuse

MDS see Myelodysplastic Syndromes

Your bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting. If you have a myelodysplastic syndrome, the stem cells do not mature into healthy blood cells. Many of them die in the bone marrow. This means that you do not have enough healthy cells, which can lead to infection, anemia, or easy bleeding. Myelodysplastic syndromes often do not cause early symptoms and are sometimes found during a routine blood test. If you have symptoms, they may include Shortness of breath Weakness or feeling tired Skin that is paler than usual Easy bruising or bleeding Pinpoint spots under the skin caused by bleeding Fever or frequent infections Myelodysplastic syndromes are rare. People at higher risk are over 60, have had chemotherapy or radiation therapy, or have been exposed to certain chemicals. Treatment options include transfusions, drug therapy, chemotherapy, and blood or bone marrow stem cell transplants. NIH: National Cancer Institute

Measles

Measles is an infectious disease caused by a virus. It spreads easily from person to person. It causes a blotchy red rash. The rash often starts on the head and moves down the body. Other symptoms include Fever Cough Runny nose Conjunctivitis (pink eye) Feeling achy and run down Tiny white spots inside the mouth Sometimes measles can lead to serious problems. There is no treatment for measles, but the measles-mumps-rubella (MMR) vaccine can prevent it. "German measles", also known as rubella, is a completely different illness. Centers for Disease Control and Prevention

Mediastinal Disorders see Chest Injuries and Disorders

The chest is the part of the body between your neck and your abdomen. It includes the ribs and breastbone. Inside your chest are several organs, including the heart, lungs, and esophagus. The pleura, a large thin sheet of tissue, lines the inside of the chest cavity. Chest injuries and disorders include Heart diseases Lung diseases and collapsed lung Pleural disorders Esophagus disorders Broken ribs Thoracic aortic aneurysms Disorders of the mediastinum, the space between the lungs, breastbone, and spine

Medicaid

Medicaid is government health insurance that helps many low-income people in the United States to pay their medical bills. The Federal government sets up general guidelines for the program, but each state has its own rules. Your state might require you to pay a part of the cost for some medical services. You have to meet certain requirements to get Medicaid help. These might involve Your age Whether you are pregnant, disabled, or blind Your income and resources Whether or not you are a U.S. citizen or, if not, what your immigration status is Centers for Medicare and Medicaid Services

Medical Device Safety

A medical device is any product used to diagnose, cure, or treat a condition, or to prevent disease. They range from small and simple, like a blood glucose meter, to large and complicated, like a ventilator. You might use one at home or at work, or you may need one in a hospital. To use medical devices safely Know how your device works. Keep instructions close by Understand and properly respond to device alarms Have a back-up plan and supplies in the event of an emergency Keep emergency numbers available and update them as needed Educate your family and caregivers about your device Food and Drug Administration

Medical Ethics

The field of ethics studies principles of right and wrong. There is hardly an area in medicine that doesn't have an ethical aspect. For example, there are ethical issues relating to End of life care: Should a patient receive nutrition? What about advance directives and resuscitation orders? Abortion: When does life begin? Is it ethical to terminate a pregnancy with a birth defect? Genetic and prenatal testing: What happens if you are a carrier of a defect? What if testing shows that your unborn baby has a defect? Birth control: Should it be available to minors? Is it ethical to harvest embryonic stem cells to treat diseases? Organ donation: Must a relative donate an organ to a sick relative? Your personal health information: who has access to your records? Patient rights: Do you have the right to refuse treatment? When you talk with your doctor, is it ethical for her to withhold information from you or your family?

Medical Professions see Health Occupations

Every day, around the clock, people who work in the health care industry provide care for millions of people, from newborns to the very ill. In fact, the health care industry is one of largest providers of jobs in the United States. Many health jobs are in hospitals. Others are in nursing homes, doctors' offices, dentists' offices, outpatient clinics and laboratories. To work in a health occupation, you often must have special training. Some, like doctors, must have more than 4 years of college. Bureau of Labor Statistics

Medical Research see Understanding Medical Research

It seems to happen almost every day - you hear about the results of a new medical research study. Sometimes the results of one study seem to disagree with the results of another study. It's important to be critical when reading or listening to reports of new medical findings. Some questions that can help you evaluate health information include: Was the study in animals or people? Does the study include people like you? How big was the study? Was it a randomized controlled clinical trial? Where was the research done? If a new treatment was being tested, were there side effects? Who paid for the research? Who is reporting the results? NIH: National Institutes of Health

Medicare

Medicare is the U.S. government's health insurance program for people age 65 or older. Some people under age 65 can qualify for Medicare, too. They include those with disabilities, permanent kidney failure, or amyotrophic lateral sclerosis. Medicare helps with the cost of health care. It does not cover all medical expenses or the cost of most long-term care. The program has four parts: Part A is hospital insurance Part B helps pay for medical services that Part A doesn't cover Part C is called Medicare Advantage. If you have Parts A and B, you can choose this option to receive all of your health care through a provider organization, like an HMO. Part D is prescription drug coverage. It helps pay for some medicines.

Medicare Prescription Drug Coverage

Part D is the name of Medicare's prescription drug coverage. It's insurance that helps people pay for prescription drugs. It is available to everyone who has Medicare. It provides protection if you pay high drug costs or have unexpected prescription drug bills. It doesn't cover all costs. You have to pay part of the cost of prescription drugs. Most people also have to pay an additional monthly cost. Private companies provide Medicare prescription drug coverage. You choose the drug plan you like best. Whether or not you should sign up depends on how good your current coverage is. You need to sign up as soon as you are eligible for Medicare. Otherwise, there may be additional charges. Centers for Medicare and Medicaid Services

Medication Errors

Medicines cure infectious diseases, prevent problems from chronic diseases, and ease pain. But medicines can also cause harmful reactions if not used correctly. Errors can happen in the hospital, at the doctor's office, at the pharmacy, or at home. You can help prevent errors by Knowing your medicines. Keep a list of the names of your medicines, how much you take, and when you take them. Include over-the-counter medicines, vitamins, and supplements and herbs. Take this list to all your doctor visits. Reading medicine labels and following the directions. Don't take medications prescribed for someone else. Taking extra caution when giving medicines to children. Asking questions. If you don't know the answers to these questions, ask your doctor or pharmacist. Why am I taking this medicine? What are the common problems to watch out for? What should I do if they occur? When should I stop this medicine? Can I take this medicine with the other medicines on my list? Centers for Disease Control and Prevention

Medicinal Herbs see Herbal Medicine

An herb is a plant or plant part used for its scent, flavor, or therapeutic properties. Herbal medicines are one type of dietary supplement. They are sold as tablets, capsules, powders, teas, extracts, and fresh or dried plants. People use herbal medicines to try to maintain or improve their health. Many people believe that products labeled "natural" are always safe and good for them. This is not necessarily true. Herbal medicines do not have to go through the testing that drugs do. Some herbs, such as comfrey and ephedra, can cause serious harm. Some herbs can interact with prescription or over-the-counter medicines. If you are thinking about using an herbal medicine, first get information on it from reliable sources. Make sure to tell your health care provider about any herbal medicines you are taking. NIH: National Center for Complementary and Integrative Health

Medicines

You may need to take medicines every day, or only once in a while. Either way, you want to make sure that the medicines are safe and will help you get better. In the United States, the Food and Drug Administration is in charge of assuring the safety and effectiveness of both prescription and over-the-counter medicines. Even safe drugs can cause unwanted side effects or interactions with food or other medicines you may be taking. They may not be safe during pregnancy. To reduce the risk of reactions and make sure that you get better, it is important for you to take your medicines correctly and be careful when giving medicines to children.

Medicines and Children

When it comes to taking medicines, kids aren't just small adults. For prescription medicines, there is a "Pediatric" section of the label. It says whether the medication has been studied for its effects on children. It also tells you what ages have been studied. Aside from drugs for fever or pain, most over-the-counter products haven't actually been studied in children for effectiveness, safety, or dosing. When you give medicine to your child, be sure you're giving the right medicine and the right amount. Read and follow the label directions. Use the correct dosing device. If the label says two teaspoons and you're using a dosing cup with ounces only, don't guess. Get the proper measuring device. Don't substitute another item, such as a kitchen spoon. Talk to your doctor, pharmacist, or other health care provider before giving two medicines at the same time. That way, you can avoid a possible overdose or an unwanted interaction. Follow age and weight limit recommendations. If the label says don't give to children under a certain age or weight, don't do it. Food and Drug Administration

Medicines and Pregnancy see Pregnancy and Medicines

Not all medicines are safe to take when you are pregnant. Some medicines can harm your baby. That includes over-the-counter or prescription drugs, herbs, and supplements. Always speak with your health care provider before you start or stop any medicine. Not using medicine that you need may be more harmful to you and your baby than using the medicine. For example, many pregnant women take prescription medicines for health problems like diabetes, asthma, seizures, and heartburn. The decision about whether or not to take a medicine depends on the risks and benefits. You and your health care provider should make this choice together. Pregnant women should not take regular vitamins. They may have too much or too little of the vitamins that you need. There are special vitamins for pregnant women. It is important to take 0.4 mg of folic acid every day before you become pregnant through the first part of your pregnancy. Folic acid helps to prevent birth defects of the baby's brain or spine. Food and Drug Administration

Medicines, Over-the-Counter see Over-the-Counter Medicines

Over-the-counter (OTC) medicines are drugs you can buy without a prescription. Some OTC medicines relieve aches, pains and itches. Some prevent or cure diseases, like tooth decay and athlete's foot. Others help manage recurring problems, like migraines. In the United States, the Food and Drug Administration decides whether a medicine is safe enough to sell over-the-counter. Taking OTC medicines still has risks. Some interact with other medicines, supplements, foods or drinks. Others cause problems for people with certain medical conditions. If you're pregnant, talk to your health care provider before taking any medicines. It is important to take medicines correctly, and be careful when giving them to children. More medicine does not necessarily mean better. You should never take OTC medicines longer or in higher doses than the label recommends. If your symptoms don't go away, it's a clear signal that it's time to see your healthcare provider. Food and Drug Administration

Mediterranean Anemia see Thalassemia

Thalassemias are inherited blood disorders. If you have one, your body makes fewer healthy red blood cells and less hemoglobin. Hemoglobin is a protein that carries oxygen to the body. That leads to anemia. Thalassemias occur most often among people of Italian, Greek, Middle Eastern, Southern Asian, and African descent. Thalassemias can be mild or severe. Some people have no symptoms or mild anemia. The most common severe type in the United States is called Cooley's anemia. It usually appears during the first two years of life. People with it may have severe anemia, slowed growth and delayed puberty, and problems with the spleen, liver, heart, or bones. Doctors diagnose thalassemias using blood tests. Treatments include blood transfusions and treatment to remove excess iron from the body. If you have mild symptoms or no symptoms, you may not need treatment. In some severe cases, you may need a bone marrow transplant. NIH: National Heart, Lung, and Blood Institute

Melanoma

Melanoma is the most serious type of skin cancer. Often the first sign of melanoma is a change in the size, shape, color, or feel of a mole. Most melanomas have a black or black-blue area. Melanoma may also appear as a new mole. It may be black, abnormal, or "ugly looking." Thinking of "ABCDE" can help you remember what to watch for: Asymmetry - the shape of one half does not match the other Border - the edges are ragged, blurred or irregular Color - the color is uneven and may include shades of black, brown and tan Diameter - there is a change in size, usually an increase Evolving - the mole has changed over the past few weeks or months Surgery is the first treatment of all stages of melanoma. Other treatments include chemotherapy and radiation, biologic, and targeted therapies. Biologic therapy boosts your body's own ability to fight cancer. Targeted therapy uses substances that attack cancer cells without harming normal cells. NIH: National Cancer Institute

Memory

Every day, you have different experiences and you learn new things. Your brain cannot store all of that information, so it has to decide what is worth remembering. Memory is the process of storing and then remembering this information. There are different types of memory. Short-term memory stores information for a few seconds or minutes. Long-term memory stores it for a longer period of time. Memory doesn't always work perfectly. As you grow older, it may take longer to remember things. It's normal to forget things once in awhile. We've all forgotten a name, where we put our keys, or if we locked the front door. If you are a senior who forget things more often than others your age, you may have mild cognitive impairment. Forgetting how to use your phone or find your way home may be signs of a more serious problem, such as Alzheimer's disease Other types of dementia Stroke Depression Head injuries Blood clots or tumors in the brain Kidney, liver, or thyroid problems Reactions to certain medicines If you're worried about your forgetfulness, see your health care provider. NIH: National Institute on Aging

Men's Health

Most men need to pay more attention to their health. Compared to women, men are more likely to Smoke and drink Make unhealthy or risky choices Put off regular checkups and medical care There are also health conditions that only affect men, such as prostate cancer and low testosterone. Many of the major health risks that men face - like colon cancer or heart disease - can be prevented and treated with early diagnosis. Screening tests can find diseases early, when they are easier to treat. It's important to get the screening tests you need.

Meniere's Disease

Meniere's disease is a disorder of the inner ear. It can cause severe dizziness, a roaring sound in your ears called tinnitus, hearing loss that comes and goes and the feeling of ear pressure or pain. It usually affects just one ear. It is a common cause of hearing loss. Attacks of dizziness may come on suddenly or after a short period of tinnitus or muffled hearing. Some people have single attacks of dizziness once in a while. Others may have many attacks close together over several days. Some people with Meniere's disease have "drop attacks" during which the dizziness is so bad they lose their balance and fall. Scientists don't yet know the cause. They think that it has to do with the fluid levels or the mixing of fluids in the canals of your inner ear. Doctors diagnose it based on a physical exam and your symptoms. A hearing test can check to see how it has affected your hearing. There is no cure. Treatments include medicines to control dizziness, limiting salt in your diet, and taking water pills. A device that fits into the outer ear and delivers air pulses to the middle ear can help. Severe cases may require surgery. NIH: National Institute on Deafness and Other Communication Disorders

Meningioma see Brain Tumors

A brain tumor is a growth of abnormal cells in the tissues of the brain. Brain tumors can be benign, with no cancer cells, or malignant, with cancer cells that grow quickly. Some are primary brain tumors, which start in the brain. Others are metastatic, and they start somewhere else in the body and move to the brain. Brain tumors can cause many symptoms. Some of the most common are Headaches, often in the morning Nausea and vomiting Changes in your ability to talk, hear, or see Problems with balance or walking Problems with thinking or memory Feeling weak or sleepy Changes in your mood or behavior Seizures Doctors diagnose brain tumors by doing a neurologic exam and tests including an MRI, CT scan, and biopsy. Treatment options include watchful waiting, surgery, radiation therapy, chemotherapy, and targeted therapy. Targeted therapy uses substances that attack cancer cells without harming normal cells. Many people get a combination of treatments. NIH: National Cancer Institute

Meningitis

Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis. You get it when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare, but can be deadly. It usually starts with bacteria that cause a cold-like infection. It can cause stroke, hearing loss, and brain damage. It can also harm other organs. Pneumococcal infections and meningococcal infections are the most common causes of bacterial meningitis. Anyone can get meningitis, but it is more common in people with weak immune systems. Meningitis can get serious very quickly. You should get medical care right away if you have A sudden high fever A severe headache A stiff neck Nausea or vomiting Early treatment can help prevent serious problems, including death. Tests to diagnose meningitis include blood tests, imaging tests, and a spinal tap to test cerebrospinal fluid. Antibiotics can treat bacterial meningitis. Antiviral medicines may help some types of viral meningitis. Other medicines can help treat symptoms. There are vaccines to prevent some of the bacterial infections that cause meningitis. NIH: National Institute of Neurological Disorders and Stroke

Meningococcal Infections

Meningococci are a type of bacteria that cause serious infections. The most common infection is meningitis, which is an inflammation of the thin tissue that surrounds the brain and spinal cord. Meningococci can also cause other problems, including a serious bloodstream infection called sepsis. Meningococcal infections can spread from person to person. Risk factors include Age - it is more common in infants, teens, and young adults Living in close quarters, such as in college dorms or military settings Certain medical conditions, such as not having a spleen Travel to areas where meningococcal disease is common In its early stages, you may have flu-like symptoms and a stiff neck. But the disease can progress quickly and can be fatal. Early diagnosis and treatment are extremely important. Lab tests on your blood and cerebrospinal fluid can tell if you have it. Treatment is with antibiotics. Since the infection spreads from person to person, family members may also need to be treated. A vaccine can prevent meningococcal infections.

Meningococcemia see Meningococcal Infections

Meningococci are a type of bacteria that cause serious infections. The most common infection is meningitis, which is an inflammation of the thin tissue that surrounds the brain and spinal cord. Meningococci can also cause other problems, including a serious bloodstream infection called sepsis. Meningococcal infections can spread from person to person. Risk factors include Age - it is more common in infants, teens, and young adults Living in close quarters, such as in college dorms or military settings Certain medical conditions, such as not having a spleen Travel to areas where meningococcal disease is common In its early stages, you may have flu-like symptoms and a stiff neck. But the disease can progress quickly and can be fatal. Early diagnosis and treatment are extremely important. Lab tests on your blood and cerebrospinal fluid can tell if you have it. Treatment is with antibiotics. Since the infection spreads from person to person, family members may also need to be treated. A vaccine can prevent meningococcal infections.

Meniscus see Knee Injuries and Disorders

Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking. Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair and walking. This can have a big impact on your life. The most common disease affecting the knee is osteoarthritis. The cartilage in the knee gradually wears away, causing pain and swelling. Injuries to ligaments and tendons also cause knee problems. A common injury is to the anterior cruciate ligament (ACL). You usually injure your ACL by a sudden twisting motion. ACL and other knee injuries are common sports injuries. Treatment of knee problems depends on the cause. In some cases your doctor may recommend knee replacement. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Menopausal Hormone Therapy see Hormone Replacement Therapy

Menopause is the time in a woman's life when her period stops. It is a normal part of aging. In the years before and during menopause, the levels of female hormones can go up and down. This can cause symptoms such as hot flashes and vaginal dryness. Some women take hormone replacement therapy (HRT), also called menopausal hormone therapy, to relieve these symptoms. HRT may also protect against osteoporosis. However, HRT also has risks. It can increase your risk of breast cancer, heart disease, and stroke. Certain types of HRT have a higher risk, and each woman's own risks can vary depending upon her health history and lifestyle. You and your health care provider need to discuss the risks and benefits for you. If you do decide to take HRT, it should be the lowest dose that helps and for the shortest time needed. Taking hormones should be re-evaluated every six months. NIH: National Heart, Lung, and Blood Institute

Menopause

Menopause is the time in a woman's life when her period stops. It usually occurs naturally, most often after age 45. Menopause happens because the woman's ovaries stop producing the hormones estrogen and progesterone. A woman has reached menopause when she has not had a period for one year. Changes and symptoms can start several years earlier. They include A change in periods - shorter or longer, lighter or heavier, with more or less time in between Hot flashes and/or night sweats Trouble sleeping Vaginal dryness Mood swings Trouble focusing Less hair on head, more on face Some symptoms require treatment. Talk to your doctor about how to best manage menopause. Make sure the doctor knows your medical history and your family medical history. This includes whether you are at risk for heart disease, osteoporosis, or breast cancer. Dept. of Health and Human Services Office on Women's Health

Menopause, Male see Men's Health

Most men need to pay more attention to their health. Compared to women, men are more likely to Smoke and drink Make unhealthy or risky choices Put off regular checkups and medical care There are also health conditions that only affect men, such as prostate cancer and low testosterone. Many of the major health risks that men face - like colon cancer or heart disease - can be prevented and treated with early diagnosis. Screening tests can find diseases early, when they are easier to treat. It's important to get the screening tests you need.

Menstruation

Menstruation, or period, is normal vaginal bleeding that occurs as part of a woman's monthly cycle. Every month, your body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus. It passes out of the body through the vagina. Periods usually start between age 11 and 14 and continue until menopause at about age 51. They usually last from three to five days. Besides bleeding from the vagina, you may have Abdominal or pelvic cramping pain Lower back pain Bloating and sore breasts Food cravings Mood swings and irritability Headache and fatigue Premenstrual syndrome, or PMS, is a group of symptoms that start before the period. It can include emotional and physical symptoms. Consult your health care provider if you have big changes in your cycle. They may be signs of other problems that should be treated. NIH: National Institute of Child Health and Human Development

Mental Disorders

Mental disorders include a wide range of problems, including Anxiety disorders, including panic disorder, obsessive-compulsive disorder, post-traumatic stress disorder, and phobias Bipolar disorder Depression Mood disorders Personality disorders Psychotic disorders, including schizophrenia There are many causes of mental disorders. Your genes and family history may play a role. Your life experiences, such as stress or a history of abuse, may also matter. Biological factors can also be part of the cause. A traumatic brain injury can lead to a mental disorder. A mother's exposure to viruses or toxic chemicals while pregnant may play a part. Other factors may increase your risk, such as use of illegal drugs or having a serious medical condition like cancer. Medications and counseling can help many mental disorders.

Mental Health

Mental health includes our emotional, psychological, and social well-being. It affects how we think, feel and act as we cope with life. It also helps determine how we handle stress, relate to others, and make choices. Mental health is important at every stage of life, from childhood and adolescence through adulthood. Mental illnesses are serious disorders which can affect your thinking, mood, and behavior. There are many causes of mental disorders. Your genes and family history may play a role. Your life experiences, such as stress or a history of abuse, may also matter. Biological factors can also be part of the cause. Mental disorders are common, but treatments are available.

Mental Health, Child see Child Mental Health

It's important to recognize and treat mental illnesses in children early on. Once mental illness develops, it becomes a regular part of your child's behavior. This makes it more difficult to treat. But it's not always easy to know when your child has a serious problem. Everyday stresses can cause changes in your child's behavior. For example, getting a new brother or sister or going to a new school may cause a child to temporarily act out. Warning signs that it might be a more serious problem include Problems in more than one setting (at school, at home, with peers) Changes in appetite or sleep Social withdrawal or fear of things he or she did not used to be not afraid of Returning to behaviors more common in younger children, such as bedwetting Signs of being upset, such as sadness or tearfulness Signs of self-destructive behavior, such as head-banging or suddenly getting hurt often Repeated thoughts of death To diagnose mental health problems, the doctor or mental health specialist looks at your child's signs and symptoms, medical history, and family history. Treatments include medicines and talk therapy. NIH: National Institute of Mental Health

Mental Health, Teen see Teen Mental Health

Being a teenager is hard. You're under stress to be liked, do well in school, get along with your family, and make big decisions. You can't avoid most of these pressures, and worrying about them is normal. But feeling very sad, hopeless or worthless could be warning signs of a mental health problem. Mental health problems are real, painful, and sometimes severe. You might need help if you have the signs mentioned above, or if you Often feel very angry or very worried Feel grief for a long time after a loss or death Think your mind is controlled or out of control Use alcohol or drugs Exercise, diet and/or binge-eat obsessively Hurt other people or destroy property Do reckless things that could harm you or others Mental health problems can be treated. To find help, talk to your parents, school counselor, or health care provider.

Mental Retardation see Developmental Disabilities

Developmental disabilities are severe, long-term problems. They may be physical, such as blindness. They may affect mental ability, such as learning disorders. Or the problem can be both physical and mental, such as Down syndrome. The problems are usually life-long, and can affect everyday living. There are many causes of developmental disabilities, including Genetic or chromosome abnormalities. These cause conditions such as Down syndrome and Rett syndrome. Prenatal exposure to substances. Drinking alcohol when pregnant can cause fetal alcohol spectrum disorders. Certain viral infections during pregnancy Preterm birth Often there is no cure, but treatment can help the symptoms. Treatments include physical, speech, and occupational therapy. Special education classes and psychological counseling can also help. NIH: National Institute of Child Health and Human Development

Mercury

Mercury is an element that is found in air, water and soil. It has several forms. Metallic mercury is a shiny, silver-white, odorless liquid. If heated, it is a colorless, odorless gas. It also combines with other elements to form powders or crystals. Mercury is in many products. Metallic mercury is used in glass thermometers, silver dental fillings, and button batteries. Mercury salts may be used in skin creams and ointments. It's also used in many industries. Mercury in the air settles into water. It can pass through the food chain and build up in fish, shellfish, and animals that eat fish. The nervous system is sensitive to all forms of mercury. Exposure to high levels can damage the brain and kidneys. Pregnant women can pass the mercury in their bodies to their babies. It is important to protect your family from mercury exposure: Carefully handle and dispose of products that contain mercury Limit your consumption of fish with higher levels of mercury Agency for Toxic Substances and Disease Registry

Merkel Cell Cancer see Skin Cancer

Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common. Anyone can get skin cancer, but it is more common in people who Spend a lot of time in the sun or have been sunburned Have light-colored skin, hair and eyes Have a family member with skin cancer Are over age 50 You should have your doctor check any suspicious skin markings and any changes in the way your skin looks. Treatment is more likely to work well when cancer is found early. If not treated, some types of skin cancer cells can spread to other tissues and organs. Treatments include surgery, radiation therapy, chemotherapy, photodynamic therapy (PDT), and biologic therapy. PDT uses a drug and a type of laser light to kill cancer cells. Biologic therapy boosts your body's own ability to fight cancer. NIH: National Cancer Institute

MERS see Coronavirus Infections

Coronaviruses are common viruses that most people get some time in their life. They are common throughout the world, and they can infect people and animals. Several different coronaviruses can infect people and make them sick. They usually cause mild to moderate upper-respiratory illness. But, some coronaviruses can cause severe illness. Coronaviruses probably spread through the air by coughing or sneezing, or by close personal contact. If you get infected, symptoms may include Runny nose Cough Sore throat Fever You may be able to reduce your risk of infection by washing your hands often with soap and water, not touching your eyes, nose, or mouth, and avoiding close contact with people who are sick. There is no vaccine to prevent coronavirus infection. There are no specific treatments. You can relieve symptoms with pain and fever medicines and rest. Centers for Disease Control and Prevention

Mesothelioma

The tissue that lines your lungs, stomach, heart, and other organs is called mesothelium. Mesothelioma is a tumor of that tissue. It usually starts in the lungs, but can also start in the abdomen or other organs. It can be benign (not cancer) or malignant (cancer.) Malignant mesothelioma is a rare but serious type of cancer. Most people who get it have worked on jobs where they inhaled asbestos particles. After being exposed to asbestos, it usually takes a long time for the disease to form. Symptoms include Trouble breathing Pain under the rib cage Pain, swelling, or lumps in the abdomen Weight loss for no known reason Sometimes it is hard to tell the difference between malignant mesothelioma and lung cancer. Your doctor uses imaging tests and a biopsy to make the diagnosis. Malignant mesothelioma is often found when it is advanced. This makes it harder to treat. Treatment may include surgery, radiation, and/or chemotherapy. NIH: National Cancer Institute

Metabolic Disorders

Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues, such as your liver, muscles, and body fat. A metabolic disorder occurs when abnormal chemical reactions in your body disrupt this process. When this happens, you might have too much of some substances or too little of other ones that you need to stay healthy. There are different groups of disorders. Some affect the breakdown of amino acids, carbohydrates, or lipids. Another group, mitochondrial diseases, affects the parts of the cells that produce the energy. You can develop a metabolic disorder when some organs, such as your liver or pancreas, become diseased or do not function normally. Diabetes is an example.

Metabolic Panel

A metabolic panel is a group of tests that measures different chemicals in the blood. These tests are usually done on the fluid (plasma) part of blood. The tests provide information about your body's chemical balance and metabolism. They can give doctors information about your muscles (including the heart), bones, and organs, such as the kidneys and liver. There are two types: basic metabolic panel (BMP) and comprehensive metabolic panel (CMP). The BMP checks your blood sugar, calcium, and electrolytes. The BMP also has tests such as creatinine to check your kidney function. The CMP includes all of those tests, as well as tests of your cholesterol, protein levels, and liver function. You probably need to fast (not eat any food) before the test. Your doctor will tell you how to prepare for the test you are having.

Metabolic Syndrome

Metabolic syndrome is a group of conditions that put you at risk for heart disease and diabetes. These conditions are High blood pressure High blood glucose, or blood sugar, levels High levels of triglycerides, a type of fat, in your blood Low levels of HDL, the good cholesterol, in your blood Too much fat around your waist Not all doctors agree on the definition or cause of metabolic syndrome. The cause might be insulin resistance. Insulin is a hormone your body produces to help you turn sugar from food into energy for your body. If you are insulin resistant, too much sugar builds up in your blood, setting the stage for disease. NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Methadone see Pain Relievers

Pain relievers are medicines that reduce or relieve headaches, sore muscles, arthritis, or other aches and pains. There are many different pain medicines, and each one has advantages and risks. Some types of pain respond better to certain medicines than others. Each person may also have a slightly different response to a pain reliever. Over-the-counter (OTC) medicines are good for many types of pain. There are two main types of OTC pain medicines: acetaminophen (Tylenol) and nonsteroidal anti-inflammatory drugs (NSAIDs). Aspirin, naproxen (Aleve), and ibuprofen (Advil, Motrin) are examples of OTC NSAIDs. If OTC medicines don't relieve your pain, your doctor may prescribe something stronger. Many NSAIDs are also available at higher prescription doses. The most powerful pain relievers are opioids. They are very effective, but they can sometimes have serious side effects. There is also a risk of addiction. Because of the risks, you must use them only under a doctor's supervision. There are many things you can do to help ease pain. Pain relievers are just one part of a pain treatment plan.

Methamphetamine

Methamphetamine - meth for short - is a very addictive stimulant drug. It is a powder that can be made into a pill or a shiny rock (called a crystal). The powder can be eaten or snorted up the nose. It can also be mixed with liquid and injected into your body with a needle. Crystal meth is smoked in a small glass pipe. Meth at first causes a rush of good feelings, but then users feel edgy, overly excited, angry, or afraid. Meth use can quickly lead to addiction. It causes medical problems including Making your body temperature so high that you pass out Severe itching "Meth mouth" - broken teeth and dry mouth Thinking and emotional problems NIH: National Institute on Drug Abuse

Methicillin Resistant Staphylococcus Aureus see MRSA

MRSA stands for methicillin-resistant Staphylococcus aureus. It causes a staph infection (pronounced "staff infection") that is resistant to several common antibiotics. There are two types of infection. Hospital-associated MRSA happens to people in healthcare settings. Community-associated MRSA happens to people who have close skin-to-skin contact with others, such as athletes involved in football and wrestling. Infection control is key to stopping MRSA in hospitals. To prevent community-associated MRSA Practice good hygiene Keep cuts and scrapes clean and covered with a bandage until healed Avoid contact with other people's wounds or bandages Avoid sharing personal items, such as towels, washcloths, razors, or clothes Wash soiled sheets, towels, and clothes in hot water with bleach and dry in a hot dryer If a wound appears to be infected, see a health care provider. Treatments may include draining the infection and antibiotics. NIH: National Institute of Allergy and Infectious Diseases

MI see Heart Attack

Each year over a million people in the U.S. have a heart attack. About half of them die. Many people have permanent heart damage or die because they don't get help immediately. It's important to know the symptoms of a heart attack and call 9-1-1 if someone is having them. Those symptoms include Chest discomfort - pressure, squeezing, or pain Shortness of breath Discomfort in the upper body - arms, shoulder, neck, back Nausea, vomiting, dizziness, lightheadedness, sweating These symptoms can sometimes be different in women. What exactly is a heart attack? Most heart attacks happen when a clot in the coronary artery blocks the supply of blood and oxygen to the heart. Often this leads to an irregular heartbeat - called an arrhythmia - that causes a severe decrease in the pumping function of the heart. A blockage that is not treated within a few hours causes the affected heart muscle to die. NIH: National Heart, Lung, and Blood Institute

Micturition see Urine and Urination

Your kidneys make urine by filtering wastes and extra water from your blood. The waste is called urea. Your blood carries it to the kidneys. From the kidneys, urine travels down two thin tubes called ureters to the bladder. The bladder stores urine until you are ready to urinate. It swells into a round shape when it is full and gets smaller when empty. If your urinary system is healthy, your bladder can hold up to 16 ounces (2 cups) of urine comfortably for 2 to 5 hours. You may have problems with urination if you have Kidney failure Urinary tract infections An enlarged prostate Bladder control problems like incontinence, overactive bladder, or interstitial cystitis A blockage that prevents you from emptying your bladder Some conditions may also cause you to have blood or protein in your urine. If you have a urinary problem, see your healthcare provider. Urinalysis and other urine tests can help to diagnose the problem. Treatment depends on the cause. NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Middle Eastern Respiratory Syndrome see Coronavirus Infections

Coronaviruses are common viruses that most people get some time in their life. They are common throughout the world, and they can infect people and animals. Several different coronaviruses can infect people and make them sick. They usually cause mild to moderate upper-respiratory illness. But, some coronaviruses can cause severe illness. Coronaviruses probably spread through the air by coughing or sneezing, or by close personal contact. If you get infected, symptoms may include Runny nose Cough Sore throat Fever You may be able to reduce your risk of infection by washing your hands often with soap and water, not touching your eyes, nose, or mouth, and avoiding close contact with people who are sick. There is no vaccine to prevent coronavirus infection. There are no specific treatments. You can relieve symptoms with pain and fever medicines and rest. Centers for Disease Control and Prevention

Migraine

If you suffer from migraine headaches, you're not alone. About 12 percent of the U.S. population gets them. Migraines are recurring attacks of moderate to severe pain. The pain is throbbing or pulsing, and is often on one side of the head. During migraines, people are very sensitive to light and sound. They may also become nauseated and vomit. Migraine is three times more common in women than in men. Some people can tell when they are about to have a migraine because they see flashing lights or zigzag lines or they temporarily lose their vision. Many things can trigger a migraine. These include Anxiety Stress Lack of food or sleep Exposure to light Hormonal changes (in women) Doctors used to believe migraines were linked to the opening and narrowing of blood vessels in the head. Now they believe the cause is related to genes that control the activity of some brain cells. Medicines can help prevent migraine attacks or help relieve symptoms of attacks when they happen. For many people, treatments to relieve stress can also help. NIH: National Institute of Neurological Disorders and Stroke

Mild Cognitive Impairment

Some forgetfulness can be a normal part of aging. However, some people have more memory problems than other people their age. This condition is called mild cognitive impairment, or MCI. People with MCI can take care of themselves and do their normal activities. MCI memory problems may include Losing things often Forgetting to go to events and appointments Having more trouble coming up with words than other people of the same age Memory problems can also have other causes, including certain medicines and diseases that affect the blood vessels that supply the brain. Some of the problems brought on by these conditions can be managed or reversed. Your health care provider can do thinking, memory, and language tests to see if you have MCI. You may also need to see a specialist for more tests. Because MCI may be an early sign of Alzheimer's disease, it's really important to see your health care provider every 6 to 12 months. At this time, there is no proven drug treatment for MCI. Your health care provider can check to see if you have any changes in your memory or thinking skills over time. NIH: National Institute on Aging

Military Health see Veterans and Military Health

Military service members and veterans have made sacrifices to our country, and they face different health issues than civilians. During their service, they are at risk for various injuries. These injuries can happen during combat, while others involve physical stress to the body. Sometimes the injuries are life-threatening or serious enough to cause disability. Others may not be as serious, but can be painful and affect daily life. Specific types of injuries include Shrapnel and gunshot wounds Lost limbs Head and brain injuries Tinnitus and hearing loss, typically from exposure to noise Sprains and strains Limited range of motion, especially in ankles and knees There may also be a risk of health problems from exposure to environmental hazards, such as contaminated water, chemicals, infections, and burn pits. Being in combat and being separated from your family can be stressful. The stress can put service members and veterans at risk for mental health problems. These include anxiety, post-traumatic stress disorder, depression and substance abuse. Suicide can also be a concern.

Milk Allergy see Food Allergy

Food allergy is an abnormal response to a food triggered by your body's immune system. In adults, the foods that most often trigger allergic reactions include fish, shellfish, peanuts, and tree nuts, such as walnuts. Problem foods for children can include eggs, milk, peanuts, tree nuts, soy, and wheat. The allergic reaction may be mild. In rare cases it can cause a severe reaction called anaphylaxis. Symptoms of food allergy include Itching or swelling in your mouth Vomiting, diarrhea, or abdominal cramps and pain Hives or eczema Tightening of the throat and trouble breathing Drop in blood pressure Your health care provider may use a detailed history, elimination diet, and skin and blood tests to diagnose a food allergy. When you have food allergies, you must be prepared to treat an accidental exposure. Wear a medical alert bracelet or necklace, and carry an auto-injector device containing epinephrine (adrenaline). You can only prevent the symptoms of food allergy by avoiding the food. After you and your health care provider have identified the foods to which you are sensitive, you must remove them from your diet. NIH: National Institute of Allergy and Infectious Diseases

Milk Intolerance see Lactose Intolerance

Lactose intolerance means that you cannot digest foods with lactose in them. Lactose is the sugar found in milk and foods made with milk. After eating foods with lactose in them, you may feel sick to your stomach. You may also have Gas Diarrhea Swelling in your stomach Your doctor may do a blood, breath or stool test to find out if your problems are due to lactose intolerance. Lactose intolerance is not serious. Eating less food with lactose, or using pills or drops to help you digest lactose usually helps. You may need to take a calcium supplement if you don't get enough of it from your diet, since milk and foods made with milk are the most common source of calcium for most people. NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Minerals

Minerals are important for your body to stay healthy. Your body uses minerals for many different jobs, including keeping your bones, muscles, heart, and brain working properly. Minerals are also important for making enzymes and hormones. There are two kinds of minerals: macrominerals and trace minerals. You need larger amounts of macrominerals. They include calcium, phosphorus, magnesium, sodium, potassium, chloride and sulfur. You only need small amounts of trace minerals. They include iron, manganese, copper, iodine, zinc, cobalt, fluoride and selenium. Most people get the amount of minerals they need by eating a wide variety of foods. In some cases, your doctor may recommend a mineral supplement. People who have certain health problems or take some medicines may need to get less of one of the minerals. For example, people with chronic kidney disease need to limit foods that are high in potassium.

Mini-Stroke see Transient Ischemic Attack

A transient ischemic attack (TIA) is a stroke lasts only a few minutes. It happens when the blood supply to part of the brain is briefly blocked. Symptoms of a TIA are like other stroke symptoms, but do not last as long. They happen suddenly, and include Numbness or weakness, especially on one side of the body Confusion or trouble speaking or understanding speech Trouble seeing in one or both eyes Difficulty walking Dizziness Loss of balance or coordination Most symptoms of a TIA disappear within an hour, although they may last for up to 24 hours. Because you cannot tell if these symptoms are from a TIA or a stroke, you should go to the hospital right away. TIAs are often a warning sign for future strokes. Taking medicine, such as blood thinners, may reduce your risk of a stroke. Your doctor might also recommend surgery. You can also help lower your risk by having a healthy lifestyle. This includes not smoking, not drinking too much, eating a healthy diet, and exercising. It is also important to control other health problems, such as high blood pressure and cholesterol. NIH: National Institute of Neurological Disorders and Stroke

Miscarriage

A miscarriage is an unexpected loss of pregnancy before the 20th week of pregnancy. Most miscarriages happen very early in the pregnancy, often before a woman even knows she is pregnant. Factors that may contribute to miscarriage include A genetic problem with the fetus Problems with the uterus or cervix Chronic diseases, such as polycystic ovary syndrome Signs of a miscarriage include vaginal spotting, abdominal pain or cramping, and fluid or tissue passing from the vagina. Bleeding can be a symptom of miscarriage, but many women also have it in early pregnancy and don't miscarry. To be sure, contact your health care provider right away if you have bleeding. Women who miscarry early in their pregnancy usually do not need any treatment. In some cases, there is tissue left in the uterus. Doctors use a procedure called a dilatation and curettage (D&C) or medicines to remove the tissue. Counseling may help you cope with your grief. Later, if you do decide to try again, work closely with your health care provider to lower the risks. Many women who have a miscarriage go on to have healthy babies. NIH: National Institute of Child Health and Human Development

Mitochondrial Diseases

Metabolism is the process your body uses to make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system (enzymes) break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues. If you have a metabolic disorder, something goes wrong with this process. Mitochondrial diseases are a group of metabolic disorders. Mitochondria are small structures that produce energy in almost all of your cells. They make it by combining oxygen with the fuel molecules (sugars and fats) that come from your food. When the mitochondria are defective, the cells do not have enough energy. The unused oxygen and fuel molecules build up in the cells and cause damage. The symptoms of mitochondrial disease can vary. It depends on how many mitochondria are defective, and where they are in the body. Sometimes only one organ, tissue, or cell type is affected. But often the problem affects many of them. Muscle and nerve cells have especially high energy needs, so muscular and neurological problems are common. The diseases range from mild to severe. Some types can be fatal. Genetic mutations cause these diseases. They usually happen before age 20, and some are more common in infants. There are no cures for these diseases, but treatments may help with symptoms and slow down the disease. They may include physical therapy, vitamins and supplements, special diets, and medicines.

Mitral Valve Prolapse

Mitral valve prolapse (MVP) occurs when one of your heart's valves doesn't work properly. The flaps of the valve are "floppy" and don't close tightly. Most people who have the condition are born with it. It also tends to run in families. Most of the time, MVP doesn't cause any problems. Rarely, blood can leak the wrong way through the floppy valve. This can cause Palpitations (feelings that your heart is skipping a beat, fluttering, or beating too hard or too fast) Shortness of breath Cough Fatigue, dizziness, or anxiety Migraine headaches Chest discomfort Most people who have mitral valve prolapse (MVP) don't need treatment because they don't have symptoms and complications. If you need treatment for MVP, medicines can help relieve symptoms or prevent complications. Very few people will need surgery to repair or replace the mitral valve. MVP puts you at risk for infective endocarditis, a kind of heart infection. To prevent it, doctors used to prescribe antibiotics before dental work or certain surgeries. Now, only people at high risk of endocarditis need the antibiotics. NIH: National Heart, Lung, and Blood Institute

Mixed Connective Tissue Disease see Connective Tissue Disorders

Connective tissue is the material inside your body that supports many of its parts. It is the "cellular glue" that gives your tissues their shape and helps keep them strong. It also helps some of your tissues do their work. Cartilage and fat are examples of connective tissue. There are over 200 disorders that impact connective tissue. Some, like cellulitis, are the result of an infection. Injuries can cause connective tissue disorders, such as scars. Others, such as Ehlers-Danlos syndrome, Marfan syndrome, and osteogenesis imperfecta, are genetic. Still others, like scleroderma, have no known cause. Each disorder has its own symptoms and needs different treatment.

Mobility Aids

Mobility aids help you walk or move from place to place if you are disabled or have an injury. They include Crutches Canes Walkers Wheelchairs Motorized scooters You may need a walker or cane if you are at risk of falling. If you need to keep your body weight off your foot, ankle or knee, you may need crutches. You may need a wheelchair or a scooter if an injury or disease has left you unable to walk. Choosing these devices takes time and research. You should be fitted for crutches, canes and walkers. If they fit, these devices give you support, but if they don't fit, they can be uncomfortable and unsafe.

Molar Pregnancy see Tumors and Pregnancy

Tumors during pregnancy are rare, but they can happen. Tumors can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. The most common cancers in pregnancy are breast cancer, cervical cancer, lymphoma, and melanoma. Cancer itself rarely harms the baby, and some cancer treatments are safe during pregnancy. You and your health care provider will work together to find the best treatment. Your options will depend on how far along the pregnancy is, as well as the type, size, and stage of your cancer. Another type of tumor that women can get is called a gestational trophoblastic disease (GTD). It happens when a fertilized egg doesn't become a fetus. GTD is not always easy to find. It is usually benign, but some types can be malignant. The most common type of GTD is a molar pregnancy. In its early stages, it may look like a normal pregnancy. You should see your health care provider if you have vaginal bleeding (not menstrual bleeding). Treatment depends on the type of tumor, whether it has spread to other places, and your overall health.

Molds

Molds are fungi that can be found both outdoors and indoors. They grow best in warm, damp and humid conditions. If you have damp or wet spots in your house, you will probably get mold. Molds can cause health problems. Inhaling or touching mold or mold spores may cause allergic reactions or asthma attacks in sensitive people. Molds can cause fungal infections. In addition, mold exposure may irritate your eyes, skin, nose, throat, and lungs. Centers for Disease Control and Prevention

Moles

Moles are growths on the skin. They happen when pigment cells in the skin, called melanocytes, grow in clusters. Moles are very common. Most people have between 10 and 40 moles. A person may develop new moles from time to time, usually until about age 40. In older people, they tend to fade away. Moles are usually pink, tan or brown. They can be flat or raised. They are usually round or oval and no larger than a pencil eraser. About one out of every ten people has at least one unusual (or atypical) mole that looks different from an ordinary mole. They are called dysplastic nevi. They may be more likely than ordinary moles to develop into melanoma, a type of skin cancer. You should have a health care professional check your moles if they look unusual, grow larger, change in color or outline, or in any other way. NIH: National Cancer Institute

Molluscum Contagiosum see Skin Infections

Your skin helps protect you from germs, but sometimes it can get infected by them. Some common types of skin infections are Bacterial: Cellulitis and impetigo. Staphylococcal infections can also affect the skin. Viral: Shingles, warts, and herpes simplex Fungal: Athlete's foot and yeast infections Parasitic: Body lice, head lice, and scabies Treatment of skin infections depends on the cause.

Moniliasis see Yeast Infections

Candida is the scientific name for yeast. It is a fungus that lives almost everywhere, including in your body. Usually, your immune system keeps yeast under control. If you are sick or taking antibiotics, it can multiply and cause an infection. Yeast infections affect different parts of the body in different ways: Thrush is a yeast infection that causes white patches in your mouth Candida esophagitis is thrush that spreads to your esophagus, the tube that takes food from your mouth to your stomach. It can make it hard or painful to swallow. Women can get vaginal yeast infections, causing vaginitis Yeast infections of the skin cause itching and rashes Yeast infections in your bloodstream can be life-threatening Antifungal medicines get rid of yeast infections in most people. If you have a weak immune system, treatment might be more difficult.

Monkeypox Virus Infections

Monkeypox is a rare viral disease. It occurs mostly in central and western Africa. Wild rodents and squirrels carry it, but it is called monkeypox because scientists saw it first in lab monkeys. In 2003, it was reported in prairie dogs and humans in the U.S. Centers for Disease Control and Prevention

Mono see Infectious Mononucleosis

Infectious mononucleosis, or "mono", is an infection usually caused by the Epstein-Barr virus. The virus spreads through saliva, which is why it's sometimes called "kissing disease." Mono occurs most often in teens and young adults. However, you can get it at any age. Symptoms of mono include Fever Sore throat Swollen lymph glands Sometimes you may also have a swollen spleen. Serious problems are rare. A blood test can show if you have mono. Most people get better in two to four weeks. However, you may feel tired for a few months afterward. Treatment focuses on helping symptoms and includes medicines for pain and fever, warm salt water gargles and plenty of rest and fluids.

Mononucleosis see Infectious Mononucleosis

Infectious mononucleosis, or "mono", is an infection usually caused by the Epstein-Barr virus. The virus spreads through saliva, which is why it's sometimes called "kissing disease." Mono occurs most often in teens and young adults. However, you can get it at any age. Symptoms of mono include Fever Sore throat Swollen lymph glands Sometimes you may also have a swollen spleen. Serious problems are rare. A blood test can show if you have mono. Most people get better in two to four weeks. However, you may feel tired for a few months afterward. Treatment focuses on helping symptoms and includes medicines for pain and fever, warm salt water gargles and plenty of rest and fluids.

Mood Disorders

Most people feel sad or irritable from time to time. They may say they're in a bad mood. A mood disorder is different. It affects a person's everyday emotional state. Nearly one in ten people aged 18 and older have mood disorders. These include depression and bipolar disorder (also called manic depression). Mood disorders can increase a person's risk for heart disease, diabetes, and other diseases. Treatments include medication, psychotherapy, or a combination of both. With treatment, most people with mood disorders can lead productive lives.

Morphea see Scleroderma

Scleroderma means hard skin. It is a group of diseases that cause abnormal growth of connective tissue. Connective tissue is the material inside your body that gives your tissues their shape and helps keep them strong. In scleroderma, the tissue gets hard or thick. It can cause swelling or pain in your muscles and joints. Symptoms of scleroderma include Calcium deposits in connective tissues Raynaud's phenomenon, a narrowing of blood vessels in the hands or feet Swelling of the esophagus, the tube between your throat and stomach Thick, tight skin on your fingers Red spots on your hands and face No one knows what causes scleroderma. It is more common in women. It can be mild or severe. Doctors diagnose scleroderma using your medical history, a physical exam, lab tests, and a skin biopsy. There is no cure, but various treatments can control symptoms and complications. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Morton's Neuroma see Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems: Bunions - hard, painful bumps on the big toe joint Corns and calluses - thickened skin from friction or pressure Plantar warts - warts on the soles of your feet Fallen arches - also called flat feet Ill-fitting shoes often cause these problems. Aging and being overweight also increase your chances of having foot problems.

Mosquito Bites see Insect Bites and Stings

Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus. Travelers outside the United States may be at risk for malaria and other infections. To prevent insect bites and their complications Don't bother insects Use insect repellant Wear protective clothing Be careful when you eat outside because food attracts insects If you know you have severe allergic reactions to insect bites and stings (such as anaphylaxis), carry an emergency epinephrine kit

Motion Sickness

Motion sickness is a common problem in people traveling by car, train, airplanes, and especially boats. Anyone can get it, but it is more common in children, pregnant women, and people taking certain medicines. Motion sickness can start suddenly, with a queasy feeling and cold sweats. It can then lead to dizziness and nausea and vomiting. Your brain senses movement by getting signals from your inner ears, eyes, muscles, and joints. When it gets signals that do not match, you can get motion sickness. For example, if you are reading on your phone while riding a bus, your eyes are focused on something that is not moving, but your inner ear senses motion. Where you sit can make a difference. The front seat of a car, forward cars of a train, upper deck on a boat or wing seats in a plane may give you a smoother ride. Looking out into the distance - instead of trying to read or look at something in the vehicle - can also help. Centers for Disease Control and Prevention

Motor Vehicle Safety

Every year thousands of people in the U.S. die from motor vehicle crashes. Trying to prevent these crashes is one part of motor vehicle safety. Here are some things you can do to be safer on the road: Make sure your vehicle is safe and in working order Use car seats for children Wear your seat belt Don't speed or drive aggressively Don't drive impaired Safety also involves being aware of others. Share the road with bicycles and motorcycles, and watch for pedestrians.

Mouth Cancer see Oral Cancer

Oral cancer can form in any part of the mouth. Most oral cancers begin in the flat cells that cover the surfaces of your mouth, tongue, and lips. Anyone can get oral cancer, but the risk is higher if you are male, use tobacco, drink lots of alcohol, have HPV, or have a history of head or neck cancer. Frequent sun exposure is also a risk factor for lip cancer. Symptoms of oral cancer include White or red patches in your mouth A mouth sore that won't heal Bleeding in your mouth Loose teeth Problems or pain with swallowing A lump in your neck An earache Tests to diagnose oral cancer include a physical exam, endoscopy, biopsy, and imaging tests. Oral cancer treatments may include surgery, radiation therapy, and chemotherapy. Some patients have a combination of treatments. NIH: National Cancer Institute

Mouth Disorders

Your mouth is one of the most important parts of your body. Any problem that affects your mouth can make it hard to eat, drink or even smile. Some common mouth problems include Cold sores - painful sores on the lips and around the mouth, caused by a virus Canker sores - painful sores in the mouth, caused by bacteria or viruses Thrush - a yeast infection that causes white patches in your mouth Leukoplakia - white patches of excess cell growth on the cheeks, gums or tongue, common in smokers Dry mouth - a lack of enough saliva, caused by some medicines and certain diseases Gum or tooth problems Bad breath Treatment for mouth disorders varies, depending on the problem. Keeping a clean mouth by brushing and flossing often is important.

Movement Disorders

Imagine if parts of your body moved when you didn't want them to. If you have a movement disorder, you experience these kinds of impaired movement. Dyskinesia is abnormal uncontrolled movement and is a common symptom of many movement disorders. Tremors are a type of dyskinesia. Nerve diseases cause many movement disorders, such as Parkinson's disease. Other causes include injuries, autoimmune diseases, infections and certain medicines. Many movement disorders are inherited, which means they run in families. Treatment varies by disorder. Medicine can cure some disorders. Others get better when an underlying disease is treated. Often, however, there is no cure. In that case, the goal of treatment is to improve symptoms and relieve pain.

MRI Scans

Magnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside your body. Health care professionals use MRI scans to diagnose a variety of conditions, from torn ligaments to tumors. MRIs are very useful for examining the brain and spinal cord. During the scan, you lie on a table that slides inside a tunnel-shaped machine. Doing the scan can take a long time, and you must stay still. The scan is painless. The MRI machine makes a lot of noise. The technician may offer you earplugs. Before you get a scan, tell your doctor if you Are pregnant Have pieces of metal in your body. You might have metal in your body if you have a shrapnel or bullet injury or if you are a welder. Have metal or electronic devices in your body, such as a cardiac pacemaker or a metal artificial joint

MRSA

MRSA stands for methicillin-resistant Staphylococcus aureus. It causes a staph infection (pronounced "staff infection") that is resistant to several common antibiotics. There are two types of infection. Hospital-associated MRSA happens to people in healthcare settings. Community-associated MRSA happens to people who have close skin-to-skin contact with others, such as athletes involved in football and wrestling. Infection control is key to stopping MRSA in hospitals. To prevent community-associated MRSA Practice good hygiene Keep cuts and scrapes clean and covered with a bandage until healed Avoid contact with other people's wounds or bandages Avoid sharing personal items, such as towels, washcloths, razors, or clothes Wash soiled sheets, towels, and clothes in hot water with bleach and dry in a hot dryer If a wound appears to be infected, see a health care provider. Treatments may include draining the infection and antibiotics. NIH: National Institute of Allergy and Infectious Diseases

MS see Multiple Sclerosis

Multiple sclerosis (MS) is a nervous system disease that affects your brain and spinal cord. It damages the myelin sheath, the material that surrounds and protects your nerve cells. This damage slows down or blocks messages between your brain and your body, leading to the symptoms of MS. They can include Visual disturbances Muscle weakness Trouble with coordination and balance Sensations such as numbness, prickling, or "pins and needles" Thinking and memory problems No one knows what causes MS. It may be an autoimmune disease, which happens when your immune system attacks healthy cells in your body by mistake. Multiple sclerosis affects women more than men. It often begins between the ages of 20 and 40. Usually, the disease is mild, but some people lose the ability to write, speak, or walk. There is no single test for MS. Doctors use a medical history, physical exam, neurological exam, MRI, and other tests to diagnose it. There is no cure for MS, but medicines may slow it down and help control symptoms. Physical and occupational therapy may also help. NIH: National Institute of Neurological Disorders and Stroke

Mucocutaneous Lymph Node Syndrome see Kawasaki Disease

Kawasaki disease is a rare childhood disease. It makes the walls of the blood vessels in the body become inflamed. It can affect any type of blood vessel, including the arteries, veins, and capillaries. No one knows what causes Kawasaki disease. Symptoms include High fever that lasts longer than 5 days Swollen lymph nodes in the neck A rash on the mid-section and genital area Red, dry, cracked lips and a red, swollen tongue Red, swollen palms of the hands and soles of the feet Redness of the eyes Kawasaki disease can't be passed from one child to another. There is no single test. To diagnose it, doctors look at the signs and symptoms. They may also use an echocardiogram or other tests. It is mainly treated with medicines. Rarely, medical procedures and surgery also may be used for children whose coronary arteries are affected. Kawasaki disease can't be prevented. However, most children who develop the disease fully recover - usually within weeks of getting signs and symptoms. Further problems are rare. NIH: National Heart, Lung, and Blood Institute

Mucolipidoses see Metabolic Disorders

Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues, such as your liver, muscles, and body fat. A metabolic disorder occurs when abnormal chemical reactions in your body disrupt this process. When this happens, you might have too much of some substances or too little of other ones that you need to stay healthy. There are different groups of disorders. Some affect the breakdown of amino acids, carbohydrates, or lipids. Another group, mitochondrial diseases, affects the parts of the cells that produce the energy. You can develop a metabolic disorder when some organs, such as your liver or pancreas, become diseased or do not function normally. Diabetes is an example.

Mucopolysaccharidoses see Carbohydrate Metabolism Disorders

Metabolism is the process your body uses to make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system (enzymes) break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues. If you have a metabolic disorder, something goes wrong with this process. Carbohydrate metabolism disorders are a group of metabolic disorders. Normally your enzymes break carbohydrates down into glucose (a type of sugar). If you have one of these disorders, you may not have enough enzymes to break down the carbohydrates. Or the enzymes may not work properly. This causes a harmful amount of sugar to build up in your body. That can lead to health problems, some of which can be serious. Some of the disorders are fatal. These disorders are inherited. Newborn babies get screened for many of them, using blood tests. If there is a family history of one of these disorders, parents can get genetic testing to see whether they carry the gene. Other genetic tests can tell whether the fetus has the disorder or carries the gene for the disorder. Treatments may include special diets, supplements, and medicines. Some babies may also need additional treatments, if there are complications. For some disorders, there is no cure, but treatments may help with symptoms.

Multifocal Atrial Tachycardia see Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia. The most common type of arrhythmia is atrial fibrillation, which causes an irregular and fast heart beat. Many factors can affect your heart's rhythm, such as having had a heart attack, smoking, congenital heart defects, and stress. Some substances or medicines may also cause arrhythmias. Symptoms of arrhythmias include Fast or slow heart beat Skipping beats Lightheadedness or dizziness Chest pain Shortness of breath Sweating Your doctor can run tests to find out if you have an arrhythmia. Treatment to restore a normal heart rhythm may include medicines, an implantable cardioverter-defibrillator (ICD) or pacemaker, or sometimes surgery. NIH: National Heart, Lung, and Blood Institute

Multiple Births see Twins, Triplets, Multiple Births

If you are pregnant with more than one baby, you are far from alone. Multiple births are up in the United States. More women are having babies after age 30 and more are taking fertility drugs. Both boost the chance of carrying more than one baby. A family history of twins also makes multiples more likely. Years ago, most twins came as a surprise. Now, most women know about a multiple pregnancy early. Women with multiple pregnancies should see their health care providers more often than women who are expecting one baby. Multiple pregnancy babies have a much higher risk of being born prematurely and having a low birth weight. There is also more of a risk of disabilities. Some women have to go on bed rest to delay labor. Finally, they may deliver by C-section, especially if there are three babies or more. Parenting multiples can be a challenge. Volunteer help and support groups for parents of multiples can help. Dept. of Health and Human Services Office on Women's Health

Multiple Endocrine Neoplasia see Endocrine Diseases; Parathyroid Disorders

Your endocrine system includes eight major glands throughout your body. These glands make hormones. Hormones are chemical messengers. They travel through your bloodstream to tissues or organs. Hormones work slowly and affect body processes from head to toe. These include Growth and development Metabolism - digestion, elimination, breathing, blood circulation and maintaining body temperature Sexual function Reproduction Mood If your hormone levels are too high or too low, you may have a hormone disorder. Hormone diseases also occur if your body does not respond to hormones the way it is supposed to. Stress, infection and changes in your blood's fluid and electrolyte balance can also influence hormone levels. In the United States, the most common endocrine disease is diabetes. There are many others. They are usually treated by controlling how much hormone your body makes. Hormone supplements can help if the problem is too little of a hormone.

Multiple Myeloma

Multiple myeloma is a cancer that begins in plasma cells, a type of white blood cell. These cells are part of your immune system, which helps protect the body from germs and other harmful substances. In time, myeloma cells collect in the bone marrow and in the solid parts of bones. No one knows the exact causes of multiple myeloma, but it is more common in older people and African Americans. It can run in families. Common symptoms may include Bone pain, often in the back or ribs Broken bones Weakness or fatigue Weight loss Frequent infections and fevers Feeling very thirsty Frequent urination Doctors diagnose multiple myeloma using lab tests, imaging tests, and a bone marrow biopsy. Your treatment depends on how advanced the disease is and whether you have symptoms. If you have no symptoms, you may not need treatment right away. If you have symptoms, you may have chemotherapy, stem cell transplantation, radiation, or targeted therapy. Targeted therapy uses substances that attack cancer cells without harming normal cells. NIH: National Cancer Institute

Multiple Sclerosis

Multiple sclerosis (MS) is a nervous system disease that affects your brain and spinal cord. It damages the myelin sheath, the material that surrounds and protects your nerve cells. This damage slows down or blocks messages between your brain and your body, leading to the symptoms of MS. They can include Visual disturbances Muscle weakness Trouble with coordination and balance Sensations such as numbness, prickling, or "pins and needles" Thinking and memory problems No one knows what causes MS. It may be an autoimmune disease, which happens when your immune system attacks healthy cells in your body by mistake. Multiple sclerosis affects women more than men. It often begins between the ages of 20 and 40. Usually, the disease is mild, but some people lose the ability to write, speak, or walk. There is no single test for MS. Doctors use a medical history, physical exam, neurological exam, MRI, and other tests to diagnose it. There is no cure for MS, but medicines may slow it down and help control symptoms. Physical and occupational therapy may also help. NIH: National Institute of Neurological Disorders and Stroke

Multiple System Atrophy see Autonomic Nervous System Disorders

Your autonomic nervous system is the part of your nervous system that controls involuntary actions, such as the beating of your heart and the widening or narrowing of your blood vessels. When something goes wrong in this system, it can cause serious problems, including Blood pressure problems Heart problems Trouble with breathing and swallowing Erectile dysfunction in men Autonomic nervous system disorders can occur alone or as the result of another disease, such as Parkinson's disease, alcoholism and diabetes. Problems can affect either part of the system, as in complex regional pain syndromes, or all of the system. Some types are temporary, but many worsen over time. When they affect your breathing or heart function, these disorders can be life-threatening. Some autonomic nervous system disorders get better when an underlying disease is treated. Often, however, there is no cure. In that case, the goal of treatment is to improve symptoms. NIH: National Institute of Neurological Disorders and Stroke

Mumps

Mumps is an illness caused by the mumps virus. It starts with Fever Headache Muscle aches Tiredness Loss of appetite After that, the salivary glands under the ears or jaw become swollen and tender. The swelling can be on one or both sides of the face. Symptoms last 7 to 10 days. Serious complications are rare. You can catch mumps by being with another person who has it. There is no treatment for mumps, but the measles-mumps-rubella (MMR) vaccine can prevent it. Before the routine vaccination program in the United States, mumps was a common illness in infants, children and young adults. Now it is a rare disease in the U.S. Centers for Disease Control and Prevention

Muscle Cramps

Muscle cramps are sudden, involuntary contractions or spasms in one or more of your muscles. They often occur after exercise or at night, lasting a few seconds to several minutes. It is a very common muscle problem. Muscle cramps can be caused by nerves that malfunction. Sometimes this malfunction is due to a health problem, such as a spinal cord injury or a pinched nerve in the neck or back. Other causes are Straining or overusing a muscle Dehydration A lack of minerals in your diet or the depletion of minerals in your body Not enough blood getting to your muscles Cramps can be very painful. Stretching or gently massaging the muscle can relieve this pain.

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis. Causes of muscle disorders include Injury or overuse, such as sprains or strains, cramps or tendinitis A genetic disorder, such as muscular dystrophy Some cancers Inflammation, such as myositis Diseases of nerves that affect muscles Infections Certain medicines Sometimes the cause is not known.

Muscle Strain see Sprains and Strains

A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens. A strain is a stretched or torn muscle or tendon. Tendons are tissues that connect muscle to bone. Twisting or pulling these tissues can cause a strain. Strains can happen suddenly or develop over time. Back and hamstring muscle strains are common. Many people get strains playing sports. Symptoms include pain, muscle spasms, swelling, and trouble moving the muscle. At first, treatment of both sprains and strains usually involves resting the injured area, icing it, wearing a bandage or device that compresses the area, and medicines. Later treatment might include exercise and physical therapy. NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

Muscular Dystrophy

Muscular dystrophy (MD) is a group of more than 30 inherited diseases. They all cause muscle weakness and muscle loss. Some forms of MD appear in infancy or childhood. Others may not appear until middle age or later. The different types can vary in whom they affect, which muscles they affect, and what the symptoms are. All forms of MD grow worse as the person's muscles get weaker. Most people with MD eventually lose the ability to walk. There is no cure for muscular dystrophy. Treatments can help with the symptoms and prevent complications. They include physical and speech therapy, orthopedic devices, surgery, and medications. Some people with MD have mild cases that worsen slowly. Others cases are disabling and severe. NIH: National Institute of Neurological Disorders and Stroke

Myasthenia Gravis

Myasthenia gravis is a disease that causes weakness in your voluntary muscles. These are the muscles that you control. For example, you may have weakness in the muscles for eye movement, facial expressions, and swallowing. You can also have weakness in other muscles. This weakness gets worse with activity, and better with rest. Myasthenia gravis is an autoimmune disease. Your body's immune system makes antibodies that block or change some of the nerve signals to your muscles. This makes your muscles weaker. Other conditions can cause muscle weakness, so myasthenia gravis can be hard to diagnose. Tests used to make a diagnosis include blood, nerve, muscle, and imaging tests. With treatment, the muscle weakness often gets much better. Medicines can help improve nerve-to-muscle messages and make muscles stronger. Other drugs keep your body from making so many abnormal antibodies. These medicines can have major side effects, so they should be used carefully. There are also treatments which filter abnormal antibodies from the blood or add healthy antibodies from donated blood. Sometimes, surgery to take out the thymus gland helps. Some people with myasthenia gravis go into remission. This means that they do not have symptoms. The remission is usually temporary, but sometimes it can be permanent. NIH: National Institute of Neurological Disorders and Stroke

Mycobacterial Infections

Mycobacteria are a type of germ. There are many different kinds. The most common one causes tuberculosis. Another one causes leprosy. Still others cause infections that are called atypical mycobacterial infections. They aren't "typical" because they don't cause tuberculosis. But they can still harm people, especially people with other problems that affect their immunity, such as AIDS. Sometimes you can have these infections with no symptoms at all. At other times, they can cause lung symptoms similar to tuberculosis: Cough Weight loss Coughing up blood or mucus Weakness or fatigue Fever and chills Night sweats Lack of appetite and weight loss Medicines can treat these infections, but often more than one is needed to cure the infection.

Mycoses see Fungal Infections

If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful. Some fungi reproduce through tiny spores in the air. You can inhale the spores or they can land on you. As a result, fungal infections often start in the lungs or on the skin. You are more likely to get a fungal infection if you have a weakened immune system or take antibiotics. Fungi can be difficult to kill. For skin and nail infections, you can apply medicine directly to the infected area. Oral antifungal medicines are also available for serious infections. NIH: National Institute of Allergy and Infectious Diseases

Myelodysplastic Syndromes

Your bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting. If you have a myelodysplastic syndrome, the stem cells do not mature into healthy blood cells. Many of them die in the bone marrow. This means that you do not have enough healthy cells, which can lead to infection, anemia, or easy bleeding. Myelodysplastic syndromes often do not cause early symptoms and are sometimes found during a routine blood test. If you have symptoms, they may include Shortness of breath Weakness or feeling tired Skin that is paler than usual Easy bruising or bleeding Pinpoint spots under the skin caused by bleeding Fever or frequent infections Myelodysplastic syndromes are rare. People at higher risk are over 60, have had chemotherapy or radiation therapy, or have been exposed to certain chemicals. Treatment options include transfusions, drug therapy, chemotherapy, and blood or bone marrow stem cell transplants. NIH: National Cancer Institute

Myelomeningocele see Spina Bifida

Spina bifida is a neural tube defect - a type of birth defect of the brain, spine, or spinal cord. It happens if the spinal column of the fetus doesn't close completely during the first month of pregnancy. This can damage the nerves and spinal cord. Screening tests during pregnancy can check for spina bifida. Sometimes it is discovered only after the baby is born. The symptoms of spina bifida vary from person to person. Most people with spina bifida are of normal intelligence. Some people need assistive devices such as braces, crutches, or wheelchairs. They may have learning difficulties, urinary and bowel problems, or hydrocephalus, a buildup of fluid in the brain. The exact cause of spina bifida is unknown. It seems to run in families. Taking folic acid can reduce the risk of having a baby with spina bifida. It's in most multivitamins. Women who could become pregnant should take it daily. NIH: National Institute of Neurological Disorders and Stroke

Myeloproliferative Disorders see Bone Marrow Diseases

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting. With bone marrow disease, there are problems with the stem cells or how they develop: In leukemia, a cancer of the blood, the bone marrow makes abnormal white blood cells In aplastic anemia, the bone marrow doesn't make red blood cells In myeloproliferative disorders, the bone marrow makes too many white blood cells Other diseases, such as lymphoma, can spread into the bone marrow and affect the production of blood cells Causes of bone marrow diseases include genetics and environmental factors. Tests for bone marrow diseases include blood and bone marrow tests. Treatments depend on the disorder and how severe it is. They might involve medicines, blood transfusions or a bone marrow transplant.

Myocardial Infarction see Heart Attack

Each year over a million people in the U.S. have a heart attack. About half of them die. Many people have permanent heart damage or die because they don't get help immediately. It's important to know the symptoms of a heart attack and call 9-1-1 if someone is having them. Those symptoms include Chest discomfort - pressure, squeezing, or pain Shortness of breath Discomfort in the upper body - arms, shoulder, neck, back Nausea, vomiting, dizziness, lightheadedness, sweating These symptoms can sometimes be different in women. What exactly is a heart attack? Most heart attacks happen when a clot in the coronary artery blocks the supply of blood and oxygen to the heart. Often this leads to an irregular heartbeat - called an arrhythmia - that causes a severe decrease in the pumping function of the heart. A blockage that is not treated within a few hours causes the affected heart muscle to die. NIH: National Heart, Lung, and Blood Institute

Myopathies see Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis. Causes of muscle disorders include Injury or overuse, such as sprains or strains, cramps or tendinitis A genetic disorder, such as muscular dystrophy Some cancers Inflammation, such as myositis Diseases of nerves that affect muscles Infections Certain medicines Sometimes the cause is not known.

Myopia see Refractive Errors

The cornea and lens of your eye helps you focus. Refractive errors are vision problems that happen when the shape of the eye keeps you from focusing well. The cause could be the length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens. Four common refractive errors are Myopia, or nearsightedness - clear vision close up but blurry in the distance Hyperopia, or farsightedness - clear vision in the distance but blurry close up Presbyopia - inability to focus close up as a result of aging Astigmatism - focus problems caused by the cornea The most common symptom is blurred vision. Other symptoms may include double vision, haziness, glare or halos around bright lights, squinting, headaches, or eye strain. Glasses or contact lenses can usually correct refractive errors. Laser eye surgery may also be a possibility. NIH: National Eye Institute

Myositis

Myositis means inflammation of the muscles that you use to move your body. An injury, infection, or autoimmune disease can cause it. Two specific kinds are polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of your body. Dermatomyositis causes muscle weakness, plus a skin rash. Other symptoms of myositis may include Fatigue after walking or standing Tripping or falling Trouble swallowing or breathing Doctors may use a physical exam, lab tests, imaging tests and a muscle biopsy to diagnose myositis. There is no cure for these diseases, but you can treat the symptoms. Polymyositis and dermatomyositis are first treated with high doses of a corticosteroid. Other options include medications, physical therapy, exercise, heat therapy, assistive devices, and rest. NIH: National Institute of Neurological Disorders and Stroke

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