Anal fissures often have the following characteristics: 1. They occur in young and middle-aged people, and rarely in the elderly, who have greater muscle strength and are weaker. 2. There is no previous medical history, but occasionally there is a period of defecation accompanied by pain, or even a spot of blood in the stool, which may produce pain of longer duration due to the stimulation of the anal fissure wound. When the patient meets the above characteristics, it is likely to be a manifestation of anal fissure and not hemorrhoids, and the patient should promptly go to the hospital to find a specialist to troubleshoot.