Anal fistula local anesthesia, in the penetration of anesthesia needle will have a certain pain, injection of anesthesia drugs after the pain will gradually reduce and disappear, through local anesthesia in the surgical process is not painful. Anal fistula is a granulomatous tube around the rectum of the anal canal, mainly consisting of three parts: internal opening, fistula and external opening, the internal opening is often located in the anal sinus, and the external opening is on the perianal skin. Surgical treatment is taken, either through sacral anesthesia or under local anesthesia. With local anesthesia, the needle pierces the skin during anesthesia and there will be some pain, but this pain is usually mild and can be tolerated by most people. After the injection of drugs will gradually reduce the pain, gradually disappear, local anesthesia is completed before the surgical treatment, the surgical process will not appear pain. Surgical treatment of anal fistula, need to go to the regular hospital anorectal department for diagnosis and treatment, do not have too much mental stress, through surgical treatment, generally can gradually recover.