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 (C. diff.) Infection

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

  • Club Drug Use

    Club drugs are commonly found at parties, bars, nightclubs, and concerts. Most of these drugs are illegal and can cause…

  • Clubfoot

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

  • Colds and the Flu

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

  • 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…

  • Complex Regional Pain Syndrome

    Complex regional pain syndrome (CRPS) is a chronic pain condition. It can occur after an injury. It usually affects an…

  • 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.

  • Congenital Heart Disease

    Congenital heart disease is a problem with the heart that is present at birth. “Congenital” is another way of saying…

  • 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 cornea is a clear layer of protective tissue…

  • Coronary Artery Disease (CAD)

    Coronary artery disease is also called CAD. It is the most common form of heart disease in the U.S. —…

  • 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)

    A coronavirus is a member of a family of viruses originating from animals that can cause common colds or more…

  • Croup

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

  • 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…

  • De Quervain’s Tenosynovitis

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