Duodenal Diseases [Disease/Finding] Peptic Ulcer [Disease/Finding] M0016211 Peptic Ulcer Peptic Ulcer 13200003 196697002 266437002 1024813 N0000002351 D010437 C0030920 C4880 Gastroduodenal Ulcer Ulcer that occurs in the regions of the GASTROINTESTINAL TRACT which come into contact with GASTRIC JUICE containing PEPSIN and GASTRIC ACID. It occurs when there are defects in the MUCOSA barrier. The common forms of peptic ulcers are associated with HELICOBACTER PYLORI and the consumption of nonsteroidal anti-inflammatory drugs (NSAIDS). Stomach Diseases [Disease/Finding]