One month after the anal fistula excision surgery wound hidden pain, may be a normal phenomenon, but also may be the wound infection, anal fistula recurrence and other circumstances lead to. 1. Normal phenomenon: after anal fistula excision surgery, the anal fistula site will leave a wound, coupled with the anal area belongs to the window of excretion, the recovery time will be relatively long, a small number of patients may be about a month or so has not been fully recovered, so there will be a vague sense of pain. 2. Wound infection: If the wound area is contaminated by feces or urine, it may lead to secondary infection in the area, causing redness, swelling and pain. 3. anal fistula recurrence: if the perianal throbbing and lumps, and accompanied by pus and anal moisture phenomenon, need to consider the anal fistula has recurred. Anus fistula excision more than a month after the wound pain, due to the consideration of more causes, it is recommended that the patient more monitoring of the wound abnormal phenomena, if necessary, timely consultation, give targeted treatment.