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Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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All conditions that start with the letter M
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  • Cows peak their heads out of their stalls in a barn. Mad cow disease is a rare and deadly brain disease spread by eating beef products from a cow that has been infected. There is no cure.

    Mad Cow Disease

    Mad cow disease is a rare and deadly brain disease spread by eating beef products from a cow that has…

  • A mosquito sits on human skin

    Malaria

    Malaria is a serious disease caused by a parasite. The parasite is carried by one type of mosquito. Humans get…

  • Close-up of a pink ribbon (the symbol of breast cancer awareness) in a man’s hands

    Male Breast Cancer

    Breast cancer is a type of cancer that begins in the breast. Men can get breast cancer even though it…

  • close-up of a young man in jeans holding a baseball in his hand

    Mallet Finger

    Mallet finger is an injury to your fingertip that prevents you from straightening it. It is common in sports, especially…

  • colleagues wear protective facemasks during a meeting at work

    Mass Psychogenic Illness

    Mass psychogenic illness is sometimes called mass hysteria. It is when a group of people starts feeling sick at the…

  • a mother breastfeeds her baby

    Mastitis

    Mastitis is an inflammation of the breast usually caused by an infection.

  • A woman with hives on the backs of her legs

    Mastocytosis

    Mastocytosis is the abnormal growth of cells from the immune system in your body. It can occur in people of…

  • A young girl receives the measles vaccine from a doctor. Measles is a very contagious respiratory illness that also causes a fever and a rash. It is preventable with a vaccine.

    Measles

    Measles (also called rubeola) is a serious respiratory illness. This means it affects the lungs and breathing tubes. It also…

  • Small intestine in detail illustration. A Meckel’s diverticulum is a small pouch on the wall of the small intestine that can cause stomach pain, vomiting and blood in the stool.

    Meckel's Diverticulum

    Meckel’s diverticulum is a small pouch on the wall of the lower part of the small intestine that can cause…

  • Nurse holding newborn

    Meconium Aspiration Syndrome (MAS)

    Meconium aspiration syndrome affects newborns who inhale their stool and/or amniotic fluid before, during, or after labor and delivery.

  • close-up of a person’s cheek with small patches of melasma

    Melasma

    Melasma is a common skin condition that causes brown patches to appear on the skin, usually on the face.

  • A young woman suffering from Meniere’s disease covers her ears and squeezes her eyes shut.

    Meniere’s Disease

    Meniere’s disease is an inner ear problem that can cause dizziness and ringing in the ears but is not contagious…

  • Cotton swab with fluid sample for lab test to diagnose meningitis

    Meningitis

    Meningitis is swelling of the tissue around your brain and spinal cord. There are two common types of meningitis: viral…

  • Menopause

    Menopause is when your menstrual periods permanently stop (12 months in a row without a period) and you can no…

  • Young woman with metabolic syndrome drinks water after jogging outdoors.

    Metabolic Syndrome

    Metabolic syndrome is a term for a set of risk factors for heart disease including high blood pressure, cholesterol, and…

  • two doctors in scrubs washing hands

    Methicillin-resistant Staphylococcus aureus (MRSA)

    Methicillin-resistant Staphylococcus aureus, or MRSA, is a bacterial infection of the skin that can cause bumps, swelling and pain and…

  • A laboratory rack with several tubes of urine ready for analysis

    Microscopic Hematuria

    Microscopic hematuria is the presence of red blood cells in your urine.

  • Woman with headache in front of blurry surroundings

    Migraines

    A migraine is usually an intense pounding headache that can last for hours or even days.

  • A doctor uses a stethoscope to listen to woman’s heart. Mitral valve prolapse is a heart condition in which the flaps of the mitral valve don’t close properly. Most who have it don’t need treatment.

    Mitral Valve Prolapse

    Mitral valve prolapse is a heart condition in which the flaps of the mitral valve don’t close properly. Most people…

  • doctor checking lymph nodes of a patient

    Mononucleosis

    Mononucleosis is a contagious illness caused by the Epstein-Barr virus. The virus can be found in saliva, mucus, and other…

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