What is the most common reason for massive lower gastrointestinal (GI) bleeding (LGIB)?

Updated: Jul 26, 2019
  • Author: Burt Cagir, MD, FACS; Chief Editor: BS Anand, MD  more...
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Diverticulosis is the dominant etiology of LGIB, reported as the most common reason for massive LGIB in most single-institution publications. Most diverticular bleeding occurs without concomitant diverticulitis, and diverticulitis does not increase the risk of bleeding. Risk factors for diverticular bleeding include lack of dietary fiber, constipation, advanced age, and the use of nonsteroidal anti-inflammatory drugs (NSAIDs) and aspirin.

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