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• A to Z: Acanthosis Nigricans

  Acanthosis nigricans is a condition in which the skin thickens and darkens in places.

• A to Z: Achondroplasia

  Achondroplasia is a genetic disorder that interferes with bone growth and causes dwarfism (short stature).

• A to Z: Acne, Infant

  Infant acne is common in babies, and usually goes away on its own without treatment or scarring.

• A to Z: Acute Febrile Mucocutaneous Lymph Node Syndrome (MCLS)

  See: Kawasaki Disease.

• A to Z: Acute Lymphoblastic Leukemia (ALL)

  Acute lymphoblastic leukemia is a form of cancer that causes the body to make too many lymphoblasts, a type of white blood cell.

• A to Z: Acute Myeloid Leukemia (AML)

  Learn about different types of leukemia and cancers that affect the blood and bone marrow.

• A to Z: Adenovirus

  Adenoviruses are a group of viruses that can infect the membranes (tissue linings) of the respiratory tract, eyes, intestines, and urinary tract. They are common among infants and young children.

• A to Z: Adrenal Insufficiency

  Adrenal insufficiency is a condition that happens when the adrenal glands do not work properly.

• A to Z: Adynamic Ileus

  Learn about intestinal blockages and conditions that affect the digestive tract.

• A to Z: Alcohol Abuse

  Learn about alcohol abuse and consequences of excessive drinking.