Bleeding before taking a bowel movement, consider the possibility of anal related diseases, the more common clinical hemorrhoids, anal fissure, anal papilloma, etc., need to be further examined, in order to clarify the cause of the disease. 1. hemorrhoids: is near the dentate line of the anal canal, rectum, submucosal venous plexus tortuous expansion formation, if the diet and habits of life and other aspects of inattention, can lead to the aggravation of its symptoms, in the hemorrhoidal nucleus surface mucous membrane breakage, hemorrhoidal nucleus blood vessel rupture can appear before the bowel bleeding symptoms. 2. Anal fissure: it is a crack of the skin at the anal canal, mostly related to anal tightness and dry stools. Squatting before defecation can cause the fissure to become larger, and bleeding before defecation can occur when the blood vessels at the fissure rupture. 3. Anal papilloma: benign hyperplasia of anal papillae caused by dry stool and inflammation, if the mucous membrane on its surface is broken, bleeding symptoms can occur before bowel movement. Bleeding before defecation is also seen in other reasons, it is recommended that patients seek timely medical care, improve the auxiliary examination, in order to clarify the cause of the disease, the professional physician for the cause of the corresponding treatment, so as not to delay the condition.