Complicated anal fistula surgery usually hurts for about a month to a month and a half after surgery. If it is just a simple anal fistula, then it will take about a month for the wound to heal without discharge and without pain. If it is a complex anal fistula it usually takes about one and a half months for the wound to gradually heal to have no discharge and no pain. Therefore, the patient should pay attention to eat a lighter, to eat some rich in collagen food can promote the wound healing and growth. In addition to eat more fruits and vegetables, can make the stool soften some, avoid stool dryness, constipation and so on. Complex anal fistula patients should go to the hospital in time for examination and treatment under the guidance of the doctor. Do not delay, so as to avoid danger.