Keywords: gastric ulcer, duodenal ulcer, digestive system, H. pylori, Helicobacter pylori Definition and classification Peptic ulcer disease is a condition characterized by ulcerative lesions occurring in the mucosal lining of the stomach or the proximal portion of the small intestine (duodenum). An ulcer is defined as a loss of mucosal tissue...
Gastric and duodenal ulcers