下消化道出血系指Treitz韧带以下的消化道,包括小肠和结肠、直肠的出血,临床常见急性大量出血常危及患者生命,临床症状无特异性,仅表现为鲜血或暗红色血便,少数有黑便,部分伴有腹痛等症状。但下消化道出血的病因复杂,常容易漏诊、误诊,治疗上也较困难。因而下消化道出血的诊治 Lower gastrointestinal bleeding refers to the Treitz ligament below the digestive tract, including the small intestine and colon, rectal bleeding, clinical common acute massive bleeding often endanger the lives of patients, the clinical symptoms of non-specific, only showed blood or dark red bloody stool, a few black Then, some accompanied by abdominal pain and other symptoms. However, the cause of the lower gastrointestinal bleeding complicated, often easy to miss, misdiagnosis, treatment is more difficult. Thus lower gastrointestinal bleeding diagnosis and treatment