The sequelae of anal fistula surgery, mainly including postoperative recurrence, anal dampness and itching, and anal incontinence, are as follows: First, postoperative recurrence: if the treatment of fistula or internal opening is missed during anal fistula surgery, it will lead to postoperative recurrence of anal fistula, which will also manifest as perianal swelling and pain, as well as pus symptoms. The second, anal dampness and itching: some patients with a large range of anal fistula surgery, after the incision is completely healed, will lead to the patient’s anal closure is not tight, intestinal fecal water, and mucus will leak out around the anus, thus triggering symptoms such as dampness and itching around the anus. The third, anal incontinence: anal fistula surgery, if the location of the fistula is high, and then cut off the anorectal ring during the surgery, will lead to post-operative anal incontinence.