An anal fistula is a fistula formed when the rectum or anal canal communicates with the surrounding skin. Most anal fistulas are the sequelae of perianal abscesses. Anal fistulas are characterized by localized pus flow, pain and itching. Anal fistulas are an end result of the development of perianal abscesses. After a perianal abscess becomes pus, the perianal skin or the rectal mucosa of the anal canal breaks down or is incised to drain the pus, and the connective tissue in the wall of the pus cavity grows and narrows the pus cavity, forming either a straight or curved tube, which becomes an anal fistula. The symptoms of anal fistula 1, pus: intermittent or persistent local pus, long does not close the mouth. 2, pain: when the fistula is open, generally do not feel pain, but only a local feeling of swelling. If the external mouth closes on its own and pus accumulates, local pain may appear, or there is cold and heat; if the pus flows out after ulceration, the symptoms can be quickly reduced or disappear. 3, itching: itching caused by pus constantly stimulating the skin around the anus, sometimes accompanied by perianal eczema. For high complex anal fistula, high complex anal fistula with high wire to mouth drainage was carried out, which is an excellent method for treating high complex anal fistula as it is less painful and the fistula can be fully drained without damaging too much tissue, shortening the treatment course and reducing complications. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things.