After anal fistula surgery, you can pass stool on the second or third day, but the stool should not be too hard or too coarse. Because of the recent surgery wound is not immediately healed, coarse and hard feces may make the wound rub broken bleeding. After anal fistula surgery can not be a long time without defecation, which will lead to the accumulation of feces in the intestinal tract, resulting in dry feces, hard to cause constipation, more detrimental to the recovery of the operation, so you should develop the habit of regular defecation, so as to reduce the fecal stimulation of the trauma, and is conducive to the recovery of the operation. It is recommended that the diet should be light and easy to digest, avoiding spicy, stimulating and greasy food. At the same time, keep the bowel movement and cleanliness around the anus to avoid inflammation caused by bacterial or viral infection, and change underwear frequently. Patients should actively cooperate with the postoperative care and daily dietary requirements to promote wound healing, if in doubt, consult the attending physician.