Diseases and Conditions

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

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  • young boy using spacer and mask with asthma inhaler

    Asthma

    Asthma is a chronic (long-term) disease of the lungs. It inflames and narrows the airways, making it harder to…

  • A woman puts drops in her eyes. Sjögren’s syndrome is an autoimmune disease that causes dry mouth and dry eyes. It can also cause dryness in other places.

    Sjögren’s Syndrome

    Sjögren’s syndrome is an autoimmune disease that causes dry mouth and dry eyes. It can also cause dryness in other…

  • A photo of female legs isolated on a white background

    Restless Leg Syndrome

    Restless legs syndrome is a condition in which your legs feel very uncomfortable when you’re sitting or lying down. It…

  • Acne is a common skin condition. It causes pimples to appear on the face and/or on the back, chest, arms, and neck.

    Acne

    Acne is a common skin condition. It causes bumps on the skin known as pimples to appear on the face…

  • A child scratches her head with a look of discomfort on her face. Head lice are small wingless insects that can get on your hair and scalp. Lice bites may cause scratching, skin irritation or infection.

    Head Lice

    Head lice are small wingless insects that can get on your hair and scalp. Lice bites may cause constant scratching,…

  • A man looks in the mirror at his receding hairline. It is normal to shed some hair each day. However, some people may experience excessive (more than normal) hair loss for various reasons.

    Hair Loss

    It is normal to shed some hair each day as part of this cycle. However, some people may experience excessive…

  • Close up of a child's cleft lip

    Cleft Lip and Cleft Palate

    Cleft lip and cleft palate are birth defects that happen when a baby’s lip or mouth don’t form correctly early…

  • an infant lies on her back without a diaper

    Diaper Rash

    Diaper rash is redness and rash on a baby’s bottom or genital area. It is a very common rash. Normally,…

  • 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…

  • 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…