There is pain and bleeding in the anus after defecation, and anal fissure and hemorrhoids and other diseases are considered to be the cause. 1. Anal fissure: patients with anal fissure, such as dry stool, constipation, defecation is often accompanied by blood, pain in and around the anus is obvious. The patient defecation angry struggle, pulling, squatting for a long time, resulting in muscle spasms around the anus, pain; so that the fissure collapsed, flowing bright red blood; in addition to fecal dryness scratching the mucosa of the anus and intestines, there will also be a bit of bleeding after the end of the bowel movement. 2. Hemorrhoids: common in patients with mixed hemorrhoids, when the diet is not appropriate, constipation, after defecation will cause bleeding internal hemorrhoids, external hemorrhoids pain symptoms. For patients with severe pain and bleeding hemorrhoids, they should be treated promptly. Therefore, if the patient has the above discomfort symptoms, it is recommended to consult a doctor in time, to clarify the cause of the disease, under the guidance of a professional doctor to choose the appropriate treatment plan, to avoid delaying the aggravation of the condition.