Gastroenteritis

Definitions
Gastroenteritis is a nonspecific term for various pathologic states of the gastrointestinal tract. The primary manifestation is diarrhea, but it may be accompanied by nausea, vomiting, and abdominal pain

Peptic Ulcer Disease

Definition
development of a discrete mucosal defect in the portions of the gastrointestinal tract (gastric or duodenal) exposed to acid and pepsin secretion.

Gastroesophageal Reflux Disease

Definitions
Occurs when the amount of gastric juice that refluxes into the esophagus exceeds the normal limit, causing symptoms with or without associated esophageal mucosal injury(esophagitis)