[Severe hemorrhages of the upper digestive tract].
D004381:Duodenal Ulcer; D006471:Gastrointestinal Hemorrhage; D006470:Hemorrhage; D006801:Humans; D010439:Peptic Ulcer Perforation; D013276:Stomach Ulcer
DUODENAL ULCER; HEMORRHAGE, GASTROINTESTINAL; PEPTIC ULCER PERFORATION; STOMACH ULCER