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引起老年人下消化道出血的常见病因依次为大肠癌（７７例），大肠息肉（７３例），结肠炎症（６６例），痔核等肛周病变（５５例），结肠动静脉畸形（１４例），溃疡性结肠炎等病变（４５例）。未发现病变者（６４例）。３１例大肠癌发生在横结肠至盲肠，提示老年人右半结肠癌并非少见。１９例大肠癌系由腺瘤性息肉恶变所致。５１例大肠息肉及２３例多发性息肉发生在左半结肠，提示老年人息肉或多发性息肉仍以左半结肠多见。为防止息肉恶变，对老年人大肠息肉应尽早行电凝切除术。结肠镜未能发现病因的６４例中，１５例出血系空、回肠病变所致。
The common causes of lower gastrointestinal bleeding in the elderly were colorectal cancer (77 cases), colorectal polyps (73 cases), colon inflammation (66 cases), hemorrhoidal nucleus and other perianal lesions (55 cases), and arteriovenous malformations (14 cases). ), ulcerative colitis and other lesions (45 cases). No lesions were found (64 cases). 31 cases of colorectal cancer occurred in the transverse colon to the cecum, suggesting that the elderly right colon cancer is not uncommon. 19 cases of colorectal cancer were caused by the malignant transformation of adenomatous polyps. 51 cases of colorectal polyps and 23 cases of multiple polyps occurred in the left colon, suggesting that older polyps or multiple polyps are still more common in the left colon. In order to prevent the malignant transformation of polyps, the elderly colon polyps should be treated as soon as possible by electrocoagulation. Of the 64 cases where colonoscopy failed to find the cause, 15 cases of bleeding were caused by empty and ileal lesions.