The anal fistula surgery is not a major surgery, but, after all, the anal opening is treated surgically, and you have to defecate every day, and change the medication in time after defecation, so the post-operative pain is a big problem. The severity of the pain, however, varies from person to person, depending on the condition. For simple anal fistulas, the pain is not very severe because the trauma is small, so the patient does not feel very uncomfortable after surgery. For patients with high complexity anal fistula, because the trauma is large, the trauma cavity is deep, some need to cooperate with anal fistula hanging treatment, so the post-operative pain will be more intense, and in serious cases, need to cooperate with diclofenac sodium suppository, for pain relief treatment. Therefore, there is a close relationship between post-operative anal fistula and defecation. At the same time, anal fistula surgery is not a major surgery, but it can be more troublesome. It is a little more troublesome because after anal fistula surgery, it is only half of the problem for the patient, and the later wound care, as well as the stool regulation, are crucial.