下消化道出血系指屈氏韧带以下肠道的出血。及时确定出血灶,予以有效的止血是本病治疗成功的关键。一般认为,诊断下消化道出血,应注意与以下疾病鉴别: 一、肛管疾患应注意与内痔鉴别。内痔的特点是出血量少,色鲜红,排便时滴血或呈喷射状流出,且血液不与粪便相混。用力排便时,内痔有时可脱出于肛门 Lower gastrointestinal bleeding refers to the bleeding of the intestine below the ligament of the torso. Hemorrhage timely identification, to be effective in stopping bleeding is the key to the success of this treatment. Generally believed that the diagnosis of lower gastrointestinal bleeding, should pay attention to the following diseases and identification: First, the anal canal disorders should be noted and identification of internal hemorrhoids. Internal hemorrhoids are characterized by less bleeding, red in color, blood or bowel movements when excreted, and the blood is not mixed with the stool. When forced defecation, internal hemorrhoids sometimes prolapse anus