Anal pain after defecation, pain when contracting, first consider anal fissure, anal fissure is generally due to constipation, dry stools, hard defecation process, the anus will be propped up cracks caused by. Most of the fissures are deeper, up to the muscle layer, mostly located in the anterior and posterior anal position, due to the deep fissures, so in the anal contraction of the stimulation of the muscles around the anus will produce pain symptoms. Anal fissure according to the duration of the disease is divided into acute anal fissure and chronic anal fissure, acute anal fissure most of the conservative treatment, can be improved by improving the dietary habits of defecation, assisted by the use of tylenol suppository anus, the external use of ma yinglong hemorrhoidal ointment to improve the symptoms of anal fissure, so that fissure healing. Chronic anal fissure due to the fissure become chronic ulcer, surrounded by fibrosis, by conservative treatment and can not make the fissure healing, the need for surgical treatment.