Anal impotence will not turn into rectal cancer. The main symptoms of anal fistula are recurrent perianal fluid and swelling pain, including purulent, bloody or mucus secretion, which will lead to dampness and itching in the anal area due to the stimulation of secretion, and in serious cases, perianal eczema will form. If there is an acute infection in the fistula after the external opening of the anal fistula has healed, it will feel obvious pain, and in serious cases, it can be accompanied by fever, chills, malaise and other symptoms of systemic infection, and the painful symptoms will be relieved when the abscess penetrates the external opening. Sometimes high anal fistulae are not controlled by the sphincter because the fistulae are located outside the sphincter, and there is often fecal as well as gas discharge, and recurrent episodes of the above symptoms are the clinical characteristics of fistulae. There are various classifications of fistulas, including simple and complex fistulas, high and low fistulas, which usually require surgery. Low-level simple fistulas can be treated with fistulotomy or fistulotomy, while high-grade and complex fistulas often require stitching, with care taken to avoid missing the internal opening and fistula. In addition, some doctors have tried to treat fistulas by blocking them, which can also be effective.