Anal fistula surgery for 4 months has not completely healed, mostly consider the wound infection, defecation repeated stimulation, postoperative drainage is not smooth and so on. It is recommended that the patient consult a doctor in time to clarify the cause of the disease. 1. Wound infection: anal fistula surgery wound healing time is generally about 30 to 45 days, 4 months after surgery, the wound is still not completely healed, mostly due to improper postoperative wound care, resulting in fecal bacteria infected wounds, inflammatory reaction, and then slow wound healing symptoms. 2. Repeated stimulation by defecation: too much rectal tissue is removed during the operation, resulting in narrowing of the anal canal, and repeated defecation pulls the trauma, leading to slow healing of the trauma. 3. postoperative drainage is not smooth: after anal fistula surgery, due to the operation of the infection foci of the cleanup is not complete, there is a potential infection foci or hidden cavity exists, postoperative drainage is not smooth during the recovery period, so the infection has always existed, so that the surgical wound can not be normal healing. It is recommended that patients should consult the doctor in time if they have any uncomfortable symptoms, and choose the appropriate treatment plan under the doctor’s guidance.