After anal fistula surgery, it is usually less painful after half a month or so, and at this time you basically feel no significant pain and do not affect your life. This is because in half a month or so, new flesh buds will grow and cover the exposed nerves of the original wound, so that they will not be easily stimulated and will not feel any obvious pain. Within half a month, the pain will gradually disappear. During the period of hospitalization after the surgery, some pain medication will be given to relieve the pain to a great extent. During this half-month period, the pain is usually stimulated when changing the medication and when relieving stool. It is important to change the medicine after anal fistula surgery because it needs to clean the wound, which is contaminated by stool every day and needs to be cleaned every day, so this time will produce pain. It is important to bear with it, and it basically does not hurt until about half a month later.