Gastrointestinal bleeding.
D001464:Barium; D004724:Endoscopy; D004932:Esophageal and Gastric Varices / Q000150:complications; D005756:Gastritis / Q000150:complications; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D006801:Humans; D008309:Mallory-Weiss Syndrome / Q000150:complications; D010437:Peptic Ulcer / Q000150:complications
D001464:Barium