Diseases and Conditions

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

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  • clostridium difficile bacterium isolated on black background

    Clostridium difficile (C. diff.) Infection

    A clostridium difficile (C. diff.) infection is a bacterial infection in your intestines.

  • Man Drugging Woman's Drink In Bar

    Club Drug Use

    Club drugs are common, illegal drugs used at parties, bars, nightclubs, and concerts for the purpose of getting high.

  • A photo of a baby who has on a cast on his leg

    Clubfoot

    Clubfoot is a treatable congenital condition (present at birth) that causes a baby’s foot to turn inward or downward. It…

  • Colds and the Flu

    Learn about the symptoms of and treatments for colds and the flu.

  • Baby sleeping in a position on his father’s arm to help treat colic

    Colic

    Colic is when a healthy baby cries a lot for no reason. It’s defined as crying for more than 3…

  • Colorectal Cancer

    Colorectal cancer starts in the colon or the rectum. Because they share common features, these two cancers are often referred…

  • illustration of human nervous system

    Complex Regional Pain Syndrome

    Complex regional pain syndrome is a chronic pain condition that often happens after an injury. It is believed to be…

  • man holding injured head in pain

    Concussion

    A concussion is a type of traumatic brain injury (TBI). It occurs when you hit your head, neck, or body…

  • Congenital Adrenal Hyperplasia

    Congenital adrenal hyperplasia (CAH) affects your adrenal glands, which produce hormones. Learn about the symptoms and treatment.

  • doctor listens to a baby’s heart with a stethoscope

    Congenital Heart Disease

    Congenital heart disease is a heart problem that some people are born with and can include a hole in the…

  • Woman holding stomach in pain

    Constipation

    Constipation is a common condition that makes it difficult to have a bowel movement. People of all ages experience constipation…

  • Corneal Abrasions

    A corneal abrasion is a cut or scratch on your cornea, the layer of protective tissue at the front of…

  • Man holding chest in pain

    Coronary Artery Disease (CAD)

    Coronary artery disease occurs when blood vessels that carry blood to your heart get blocked with plaque.

  • Man clutching chest in pain as a result of coronary heart disease

    Coronary Heart Disease (CHD)

    Coronary heart disease (CHD) is the most common type of heart disease. It is caused by blocked blood vessels. Learn…

  • Coronavirus Disease 2019 (COVID-19)

    COVID-19 is highly contagious and does not yet have an approved vaccine. Symptoms may include a cough, a fever, and…

  • 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…

  • Pituitary gland part human

    Cushing's Syndrome

    Cushing’s syndrome is a disease that occurs when your body makes too much of the hormone cortisol, or you get…

  • Cystic Fibrosis (CF)

    Cystic fibrosis (CF) is a genetic disorder (it runs in families) that causes your mucus and sweat glands to behave…

  • Cytomegalovirus

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

  • Woman holds her wrist in pain

    De Quervain’s Tenosynovitis

    De Quervain’s tenosynovitis is a painful condition that affects the tendons in your wrist.