Diseases and Disorders of the Digestive System

Peritonitis is an inflammation of the peritoneum, usually caused by an infectious organism that is introduced into the abdominal cavity.

Mumps was a common childhood viral disease, but widespread vaccination has now made it rare in developed countries.

Lactose intolerance is the inability to digest lactose, a sugar found in milk, due to a lack of the enzyme lactase.

A peptic ulcer, also known as peptic ulcer disease, is an erosion in the wall of the stomach, duodenum, or esophagus.