下消化道出血系指屈氏韧带以下的肠道,包括空肠、回肠、盲肠、结肠、直肠及肛门病变所致的出血。本文讨论小肠疾病所致的下消化道出血。成人小肠出血发生率在消化道出血中占1-2%,临床表现为隐性出血或血便。血便的颜色取决于小肠出血的部位、出 Lower gastrointestinal bleeding refers to the following of the flexor ligament of the intestine, including jejunum, ileum, cecum, colon, rectal and anal lesions caused by bleeding. This article discusses small intestinal diseases caused by lower gastrointestinal bleeding. The incidence of intestinal bleeding in adults accounts for 1-2% of gastrointestinal bleeding, clinical manifestations of hemorrhage or bloody stools. The color of bloody stool depends on the site of small bowel bleeding