Low anal fistula surgical incision is relatively small, and relatively simple, and fewer complications, usually about half a month after the operation, it will not affect the life, the patient will be able to normal defecation and change the medicine, basically will not affect the life, in more than 20 days to a month or so time can be completely grow well. Because the low anal fistula involves the anal sphincter less, so do low anal fistula direct excision surgery can be, the fistula internal mouth, external mouth are all removed. Because it does not cause anal incontinence, it is an anal fistula with simple surgery, fewer incisions, and fewer complications. Anal fistula also exists complex anal fistula, complex anal fistula treatment is troublesome, the recovery period is also longer.