Surgery for anal fistula is not painful. The surgery requires anesthesia, which can be divided into general anesthesia, lumbar anesthesia, sacral anesthesia, and local anesthesia. If it is a simple anal fistula, you can choose local anesthesia, which is generally suitable for simple anal fistulas, and the patient’s tolerance is good, then you can use local anesthesia. Sacral anesthesia and lumbar anesthesia are also more effective. Some patients are very afraid of surgery and have a serious condition. General anesthesia can be used and done with the patient already anesthetized. However, after the postoperative anesthesia, the surgical wound will still be painful, and pain medication is needed at this time. The postoperative pain usually lasts for about 1 week. The most painful time is when the wound is stimulated by stool, and the pain is obvious when the doctor clears the wound and changes the medicine. However, the degree of pain is also related to the individual’s pain threshold. Some people have a high tolerance for pain and do not feel very painful, while others feel severe pain.