Erosions of the upper gastrointestinal tract.
D000818:Animals; D004381:Duodenal Ulcer / Q000175:diagnosis; D004386:Duodenum; D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D005773:Gastroscopy; D006801:Humans; D011379:Prognosis; D013270:Stomach / Q000473:pathology; D013276:Stomach Ulcer / Q000145:classification / Q000175:diagnosis / Q000209:etiology / Q000473:pathology