<prompt> Massive bleed per rectal diagnosis -DiverticulosisRectal polypColitisFissure  <response>: Ans. is a i.e., Diverticulosis o Causes of lower GI bleed in adultsLocal anorectal diseases - hemorrhoids most common, anal fisures.Diverticulosis 2nd MCVascular ectasias, angiodvspiasiasNeoplasm polyps adenocarcinomaColitis Ischemic, infectious, IBDo Although hemorrhoids are the MC cause of bleeding per rectum, it causes small bleed.o Diverticulosis is the MC cause of massive bleeding per rectum.o 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. 