Complex anal fistula wound pain 5 months after surgery, may be related to trauma, the wound is not fully recovered, anal fistula recurrence and other conditions. 1. Trauma: If the wound area of the anal fistula is hit by external forces or extrusion, it may cause obvious pain in the local area, and may also be accompanied by broken skin phenomenon. 2. The wound is not fully recovered: due to the complexity of anal fistula fistula and sinus tract more, the recovery time will be relatively long, if the patient’s body is relatively poor, it is very likely that it is not fully recovered. 3. anal fistula recurrence: complex anal fistula has a certain probability of recurrence, if the patient in the wound pain at the same time, accompanied by localized swelling, anus moist, oozing, itching and other symptoms, it is possible that the fistula has recurred. Patients with the above symptoms should actively seek medical attention, do a systematic examination, clear causes of the disease after active prevention or treatment.