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• A to Z: Craniopharyngioma

  Learn about craniopharyngioma, a treatable type of brain tumor that can affect a person’s vision, growth, and development.

• A to Z: Crohn’s Disease

  Crohn’s disease causes problems in the intestine (bowel) that can prevent the bowel from digesting food well.

• A to Z: Croup

  Croup is a viral infection that causes an inflammation of the upper airways — the voice box (larynx) and windpipe (trachea).

• A to Z: Cryptorchidism

  Cryptorchidism is a condition in which one or both of a boy’s testicles (testes) have not moved into their proper place in the scrotum.

• A to Z: Cyst, Cerebral

  A cerebral cyst is a sac filled with fluid, and sometimes other materials, that develops in or around the brain.

• A to Z: Cyst, Meibomian

  A meibomian cyst, or chalazion, is a lump on the inner side of the eyelid. It occurs when one of the small oil glands becomes blocked.

• A to Z: Cyst, Ovarian

  Learn about complications of ovulation and conditions that affect the female reproductive system.

• A to Z: Cystic Fibrosis (CF)

  Learn about cystic fibrosis, an inherited disease primarily affecting the lungs and digestive system.

• A to Z: Cystitis

  Learn about cystitis (inflammation of the bladder, commonly called a bladder infection). It is the most common type of urinary tract infection (UTI).

• A to Z: Cytomegalovirus

  Learn about viral infections and conditions that can affect pregnancy, newborn babies, and people with weakened immune systems.