Obsolete anal fissure is a common disease in anus and intestinal department, the main symptoms are pain during defecation, constipation and bleeding. 1. Pain: anal fissure patients have anal sphincter expansion and contraction during defecation, and its pain is characterized by sudden severe pain during defecation, short relief, and prolonged anal pain after defecation. 2. Constipation: It is mainly due to the aggravation of pain before defecation and pain for a period of time after defecation, which leads to the vicious circle phenomenon of patients’ fear of pain, fear of defecation in their mind, dryness of stool, difficulty in defecation, and more pain after defecation. 3. Bleeding: when anal fissure patients have anal canal ulcers, the anal sphincter expands during defecation, and the ulcer surface expands and pulls, resulting in bleeding, which is mainly manifested as pain before defecation accompanied by fresh blood, and the bleeding stops after defecation. Once found bleeding, pain and other symptoms, need to go to the hospital in time, give targeted treatment, so as not to delay the condition.