Condition Library
Conditions starting with M
63 health topics beginning with the letter M.
- Macular DegenerationMacular degeneration, or age-related macular degeneration (AMD), causes vision loss in older adults. Learn about the types and what can help.
- Malabsorption SyndromesIf you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods. Learn more about different syndromes and symptoms.
- MalariaMalaria is a disease caused by a parasite transmitted by mosquitoes. It is a major cause of death worldwide. Find out about prevention and treatment.
- Male Breast CancerDid you know that men can get breast cancer? Although breast cancer is much more common in women, men can get it too. Learn more.
- Male InfertilityInfertility is when a woman can't get pregnant after a year or keeps having miscarriages. Read about the causes of male infertility and treatments.
- MalnutritionPeople suffer from hunger if they don't get enough food. Over time this can cause malnutrition. Some diseases can also cause malnutrition. Read more.
- MammographyA mammogram is a breast X-ray that helps detect issues like cancer early. It’s quick, and knowing what to expect can help ease any worries.
- Managed CareManaged care plans are a type of health insurance. Plans that restrict your choices usually cost less. Flexible plans may cost more. Learn more.
- Marfan SyndromeMarfan syndrome is a disorder that affects connective tissue. Marfan syndrome can be mild to severe. Read about symptoms and outlook.
- MarijuanaMarijuana contains the mind-altering chemical THC. Some U.S. states approve the use of medical marijuana. Read about marijuana and its effects.
- MastectomyA mastectomy is a surgery to remove a breast or part of a breast in order to treat breast cancer. A lumpectomy is done to remove a tumor. Read more.
- MeaslesMeasles or rubeola is an infectious disease caused by a virus. It spreads easily person to person, causes red blotchy rash along with other symptoms.
- MedicaidMedicaid is government health insurance that helps low-income people in the U.S. pay their medical bills. Learn about services and eligibility.
- Medical Device SafetyMedical devices can diagnose, cure, treat, or prevent some diseases. It is important to know how to use medical devices safely. Read more.
- Medical EthicsMost areas of healthcare have an ethical aspect. Learn about ethical issues in healthcare and bioethics.
- MedicareMedicare is the U.S. government's health insurance program for people age 65 and older. Medicare has four parts (A, B, C, and D). Read more.
- Medication ErrorsMedicines cure infection, prevent problems, and ease pain. Medicines can also cause harm if not used correctly. Learn about medication errors.
- MedicinesYou may take medicines every day or only once in a while. Either way, make sure your medicines are safe and will help you get better. Learn more.
- Medicines and ChildrenNever guess how to give medicines to a child. When it comes to taking medicines, kids aren't just small adults. Learn how to follow the drug label.
- MelanomaMelanoma is the most serious type of skin cancer. Most have a black or black-blue area. Learn the 'ABCDE' of what to watch for and treatment options.
- MemoryDid you forget where you put your keys? It's normal to forget things, but it can be a sign of memory problems. Read more on memory and memory loss.
- Men's HealthMany men need to pay more attention to their health. Preventive care and screening tests can help lower risks, detect problems early, and improve outcomes.
- Meniere's DiseaseMeniere's disease is a disorder of the inner ear. Symptoms include severe dizziness, tinnitus, hearing loss, and ear pressure or pain. Learn more.
- MeningitisMeningitis or spinal meningitis is inflammation of the tissue around the brain and spinal cord. Discover the differences between types of meningitis.
- Meningococcal DiseaseMeningococcal disease is the name for illness caused by meningococcal bacteria. The illnesses are often severe, but vaccines can help prevent them. Learn more.
- MenopauseMenopause is the time when your periods stop permanently. Symptoms may begin as you transition to menopause and continue for years. Learn how to get relief.
- MenstruationMenstruation (or period) happens monthly. As the uterus sheds its lining, vaginal bleeding follows. Menstrual blood is made of blood and tissue.
- Mental DisordersMental disorders (also called mental illnesses) include a wide range of problems. There are many causes. Learn more about what can help.
- Mental HealthMental health includes our emotional, psychological, and social well-being. It affects how we think, feel, and act. Your mental health can change over time.
- MercuryIt is important to protect your family from mercury exposure. Learn about mercury and how to limit exposure.
- MesotheliomaMesothelioma is a tumor of mesothelium, a tissue that lines lungs and other organs. Most people who get it have inhaled asbestos. Read the symptoms.
- Metabolic DisordersYour metabolism makes energy from the food you eat. A metabolic disorder disrupts this process. One example is diabetes. Learn more.
- Metabolic SyndromeMetabolic syndrome (also called insulin resistance syndrome) is a group of conditions that put you at risk for heart disease and diabetes. Read more.
- MethamphetamineMethamphetamine (also known as meth or crystal meth) is a very addictive drug. Read about the signs of meth addiction and health problems it causes.
- MigraineMigraines are pulsing or throbbing headaches in one area of the head. Learn about other symptoms, what triggers migraines, and how to treat them.
- Mild Cognitive ImpairmentIn mild cognitive impairment (MCI), you have more memory and thinking problems than others your age, but they don't interfere with your everyday life.
- MineralsYour body uses minerals to build bones, make hormones, and regulate your heartbeat. Read about the types of minerals and how to get them.
- MiscarriageA miscarriage is the loss of a pregnancy during the first 13 weeks of pregnancy. Read about symptoms and how to cope if you've suffered a miscarriage.
- Mitochondrial DiseasesMitochondria make energy for your cells. Diseases can affect mitochondria, often causing nerve and muscle problems. Find out more.
- Mitral Valve ProlapseMitral valve prolapse (MVP) occurs when one of your heart's valves doesn't work properly. Problems are rare. Learn about symptoms and treatment.
- Mobility AidsMobility aids help you walk or move if you are disabled or have an injury. Choosing these devices takes time and research. Learn more.
- MoldsIf you have wet spots in your house, you will probably get mold. Molds, such as black mold, can cause health problems. Read more.
- MolesMoles are skin growths, most people have them. Nevus is an unusual mole or a birthmark. Have them checked if they should change in size or color.
- Mood DisordersMost people feel sad or irritable sometimes. They may say they're in a bad mood. But mood disorders affect your everyday emotional state. Learn more.
- Mosquito BitesMosquitoes can be more than just annoying; sometimes they spread diseases. Learn about the diseases and how to protect yourself from mosquito bites.
- Motion SicknessMotion sickness can start suddenly, with a queasy feeling and cold sweats. Read about how you can prevent motion sickness while traveling.
- Motor Vehicle SafetyEvery year thousands of people in the U.S. die from car crashes. Read about how to be safe on the road.
- Mouth DisordersCommon mouth problems include cold sores, canker sores, thrush, dry mouth, and bad breath. Discover information on all of these common disorders.
- Movement DisordersMovement disorders can be caused by nerve diseases, autoimmune diseases, infections and more. Many movement disorders are inherited.
- MpoxMpox (monkeypox) is a rare disease caused by infection with the mpox virus. Learn about the symptoms and how it spreads, and vaccinations.
- MRI ScansMagnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside the body. Read about the use of MRI scan.
- MRSAMRSA infection is a staph infection that is resistant to some antibiotics. Read about MRSA symptoms, treatment, and prevention.
- Multiple MyelomaMultiple myeloma is a cancer that begins in plasma cells, a type of white blood cell. Discover symptoms, diagnostic tests, and treatments for myeloma.
- Multiple SclerosisMultiple sclerosis (MS) slows down or blocks messages between the brain and body. MS can be mild or severe. Learn about MS symptoms and treatment.
- MumpsMumps symptoms include fever, headache, and muscle aches. There is no treatment, but the MMR vaccine can prevent it. Get the facts about the vaccine.
- Muscle CrampsHave you ever had sudden, painful cramps in a muscle? These muscle spasms (also called charley horse) are very common. Learn how to relieve the pain.
- Muscle DisordersYour muscles help you move and help your body work. Muscle disorders can cause weakness, pain or even paralysis. Read more about muscle disorders.
- Muscular DystrophyMuscular dystrophy (MD) is characterized by progressive weakness and muscle damage. Read about who it affects and the prognosis.
- Myalgic Encephalomyelitis/Chronic Fatigue SyndromeMyalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a long-term illness. It causes severe fatigue and many other symptoms. Learn about managing them.
- Myasthenia GravisMyasthenia gravis (MG) is an autoimmune disease that weakens the muscles under your control. Find out about MG causes, symptoms, and treatment.
- Mycobacterial InfectionsMycobacteria are a type of germ. There are many different kinds. Read about the types of mycobacteria and the symptoms of infection.
- Myelodysplastic SyndromesMyelodysplastic Syndromes (MDS) are rare. They are sometimes found during a routine blood test. Learn symptoms, risk factors, and treatment options.
- MyositisMyositis means inflammation of the muscles. Two specific types are polymyositis and dermatomyositis. Read about myositis symptoms and management.
Source: MedlinePlus.gov, U.S. National Library of Medicine.