The visible vessel and gastrointestinal hemorrhage.
D001808:Blood Vessels; D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000601:surgery*; D006801:Humans; D053685:Laser Therapy; D007834:Lasers; D010438:Peptic Ulcer Hemorrhage / Q000175:diagnosis / Q000401:mortality / Q000601:surgery; D011379:Prognosis