Internal hemorrhoids after surgery will also anal fissure, most patients are because of dry stool, forced defecation caused by the reason. 1. Dry stools: dry stools are caused by abnormal intestinal water absorption function of the patient and unreasonable diet, and dry stools are the main cause of anal fissure. The stool will become very hard, which will cause some damage to the skin of the anal canal and tear, thus leading to anal fissure bleeding, pain, itching and other symptoms. Patients need to adjust their diets so that the stools can be shaped and softened. 2. Forced defecation: Forced defecation is very easy to cause the symptoms of anal fissure, because the stool is too dry and hard to be discharged normally, and the forced discharge under the forceful exertion will lead to anorectal mucous membrane damage, which will lead to anal fissure. If the symptoms are serious, medications such as vasodilators and laxative pills are needed to improve the situation. Anal fissure patients pay attention to the diet, do not eat greasy, spicy stimulating food, drink more water, appropriate exercise, eat more fresh fruits and vegetables to regulate, if necessary, go to the hospital for examination, follow the doctor’s advice to give diagnosis and treatment.