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下消化道出血是指十二指肠空肠韧带(Treitz 韧带)以下的空肠、回肠、盲肠、阑尾、结肠和直肠内病变的出血。引起下消化道出血的疾病很多,如肠道肿瘤、息肉、炎性肠病、憩室、血管疾病、肠扭转、大肠缺血性疾病、医源性出血以及感染性疾病、血液病、寄生虫病、中毒等。常见的病因在我国依次为大肠癌占53.4%,息肉占21.8%和肠道炎性疾病占14.2%等并发出血。西方国家则以结肠憩室病,血管发育畸形(angiody-splasia)并发出血最常见,均以老年人
Lower GI bleeding refers to bleeding in the jejunal, ileum, cecum, appendix, colon and rectum lesions below the duodenal jejunal ligament (Treitz ligament). Gastrointestinal bleeding caused by many diseases, such as intestinal cancer, polyps, inflammatory bowel disease, diverticula, vascular disease, intestinal torsion, intestinal ischemia, iatrogenic bleeding and infectious diseases, blood diseases, parasitic diseases , Poisoning and so on. Common causes of colorectal cancer in our country were followed by 53.4%, 21.8% of polyps and intestinal inflammatory disease accounted for 14.2% and other bleeding. Western countries with colonic diverticulosis, vascular deformity (angiody-splasia) concurrent bleeding is the most common, are the elderly