Common causes of bleeding per rectum are as under: - diverticular disease - infective colitis - hemorrhoids - anal fissures - ischemic colitis - malignancy - ulcerative colitis - proctitis - crohn's disease Reference: https://teachmesurgery.com/general/presentations/rectal-bleeding/ Image via: https://www.gastrojournal.org/article/S0016-5085(15)01183-X/fulltext