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• A to Z: Patent Ductus Arteriosus (PDA)

  Learn about heart conditions that affect newborn and premature babies.

• A to Z: Pectus Carinatum

  Learn more about pectus carinatum, commonly called pigeon chest.

• A to Z: Pectus Excavatum

  Learn more about pectus excavatum, commonly called sunken chest.

• A to Z: Peptic Ulcers

  Peptic ulcers are painful sores in the lining of the stomach or upper part of the small intestine.

• A to Z: Periarteritis Nodosa

  See Polyarteritis Nodosa.

• A to Z: Pericarditis

  Learn about complications of infections and conditions that affect the heart.

• A to Z: Peritonitis

  Learn more about bacterial infections, problems of the gastrointestinal tract, and complications related to infections and diseases of the abdominal organs.

• A to Z: Peritonsillar Abscess

  A peritonsillar abscess is an area of pus-filled tissue at the back of the mouth, next to one of the tonsils.

• A to Z: Pervasive Developmental Disorder (PDD)

  Learn more about this type of autism that can impair social skills, delay speech, and cause repetitive behaviors.

• A to Z: Phenylketonuria

  In this genetic disorder, the body cannot break down the amino acid phenylalanine, which then builds up in the system and affects the brain. Learn more.