<prompt> Massive bleeding per rectum in a 70 yr old patient is due to -DiverticulosisCarcinoma colonColitisPolyps  <response>: Causes of lower GI bleed in adults Local anorectal diseases - hemorrhoids most common, anal fissures.Diverticulosis 2nd MCVascular ectasias, angiodysplasiasNeoplasm polyps adenocarcinomaColitis Ischemic, infectious, IBDAlthough hemorrhoids are the MC cause of bleeding per rectum, it causes small bleed.Diverticulosis is the MC cause of massive bleeding per rectum.Diverticular bleeding is abrupt in onset usually painless, sometimes massive, and often from the right colon. The bleeding stops spontaneously in approx. 80 of patients and rebleeds in 20-25 of pts. 