Anal fistula surgery 4 months has not yet recovered well, most consider the postoperative wound infection, pus is not cleaned up, defecation repeated stimulation and other factors lead to. It is recommended that if you have any discomfort symptoms, you should consult a doctor in time to clarify the cause of the disease. 1. Postoperative wound infection: The healing time of the wound after surgery is generally longer, mostly about 30~45 days. If the wound has not recovered for a long period of time, it is often considered that the wound is not properly cared for after surgery, and the wound is susceptible to bacterial infection, which in turn leads to slow healing of the wound. 2. Pus is not cleaned up: it is mostly considered that the pus cavity is not cleaned up during the operation or the pus drainage is not smooth, resulting in postoperative trauma contamination always exists, so the healing time is longer. 3. Repeated stimulation by defecation: patients repeatedly stimulate the wound by defecation, resulting in slow healing of the wound. Therefore, after the operation, we should pay attention to more rest, do a good job of cleaning and dressing change, if there are symptoms of discomfort, go to the hospital in a timely manner to review the consultation, and follow the doctor’s advice to give treatment.