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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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  • A doctor listens to a patient’s lungs with a stethoscope. Pneumonia is an infection of the lungs usually caused by bacteria or a virus. Walking pneumonia is a mild case of pneumonia.

    Pneumonia and Walking Pneumonia

    Pneumonia is an infection of the lungs. How serious it is depends on what caused the pneumonia, your age, and…

  • a woman with keratosis pilaris scratches the back of her arm

    Keratosis Pilaris

    Keratosis pilaris is a harmless skin condition that causes small bumps to appear on the skin. They can appear anywhere…

  • woman with a keloid or raised scar on her shoulder

    Keloids (Raised Scars)

    Keloids are a type of raised scar. They occur where the skin has healed after an injury and can grow…

  • A 3-D illustration of hepatitis B virus in blood vessel with red blood cells

    Hepatitis B

    Hepatitis B is a serious liver infection caused by a virus. It is usually spread from person to person through…

  • Eosinophilic Esophagitis

    Eosinophilic esophagitis is an inflammatory, allergic disease that occurs when certain white blood cells build up in your esophageal…

  • Close up shot of woman wearing deep vein thrombosis stockings on her feet

    Deep Vein Thrombosis

    Deep vein thrombosis is a blood clot that occurs in your leg veins. It can break off and travel to…

  • Cytomegalovirus

    Cytomegalovirus (CMV) is a common virus that most people are exposed to as infants. It rarely causes symptoms, but sometimes…

  • A woman sitting in front of her computer, talking on her cell phone, and yawning

    Chronic Fatigue Syndrome

    Chronic fatigue syndrome is a disease that causes extreme fatigue that lasts for more than 6 months and interrupts daily…

  • A man working at a computer, grabbing his right wrist in pain. Carpal tunnel syndrome occurs when the tissues in your wrist get swollen or inflamed and press on the median nerve, making your hand hurt.

    Carpal Tunnel Syndrome

    Carpal tunnel syndrome is a painful disorder that occurs when the tissues in your wrist get swollen or inflamed and…

  • Thalassemia is a group of inherited blood disorders that prevent your body from producing the amount of hemoglobin it needs.

    Thalassemia

    Thalassemia is a group of inherited blood disorders that prevent your body from producing the amount of hemoglobin it…

  • An illustration of a healthy kidney and a kidney with cysts

    Kidney Cysts

    Kidney cysts are sacs filled with fluid that form in the kidneys. These small, oval or round sacs are almost…

  • Illustration of a blood clot in an artery leading to the heart

    Hypercoagulation

    Hypercoagulation is when your blood forms a clot when it shouldn’t. This clot can then travel through your body. This…

  • Doctor listens to the lung of a young girl with croup cough using a stethoscope

    Croup

    Croup is caused by a respiratory virus and causes children, usually age 5 and younger, to have a barking…

  • Woman holding clean menstrual pad

    Amenorrhea

    Amenorrhea is a medical term for when a woman does not have menstrual periods.

  • Man sitting on sofa, holding shoulder in pain

    Adhesive Capsulitis (Frozen Shoulder)

    Adhesive capsulitis, or frozen shoulder, is the condition that occurs when inflammation in your shoulder eventually leads to difficulty moving…

  • A mother holds baby being checked for bronchiolitis by a doctor with a stethoscope.

    Bronchiolitis

    Bronchiolitis is a common lung infection in infants and young children. It is usually caused by a virus. RSV is…

  • Woman holding throat in pain. When you have Hashimoto’s disease, your immune system attacks the thyroid gland. When this happens, your thyroid can’t make hormones normally.

    Hashimoto's Disease

    Hashimoto’s disease is an autoimmune disease that affects your thyroid gland.

  • Woman showing white patches of skin on her hands

    Vitiligo

    Vitiligo is a skin-coloring disorder. It produces white patches on your skin. It mostly occurs in areas of the skin…

  • Baby sticking out tongue with white coating from oral thrush

    Thrush

    Thrush is a yeast infection that occurs on your tongue and the lining of your mouth.

  • 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…

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