<prompt> True about upper GI. bleedding -a Malaena is the only symptomb Bleeding occurs beyond the ampula of vaterc Endoscopy can best diagnose itd Peptic ulcer is the MC cause e ed BUNabdacdbdecde  <response>: Upper gastrointestinal bleeding UG1B refers to blood loss within the intraluminal GIT from any location between the upper esophagus to the duodenum at the ligament of TreitzPeptic ulcer disease is the MC cause of severe UG accounting for - 50 of total cases.UGIB presents as hematemesis andor melena.Endoscopy is the diagnostic method of choice because of high sensitivity specificity.BUN is a clue to the diagnosis of Upper GI bleed. Harrison 17e p259 writes - Other clues to upper GI bleed include hyperactive bowel sounds and an elevated blood urea nitrogen level due to volume depletion and blood proteins absorbed in the small intestine. 