Fistulas are categorized into temporary fistulas and permanent fistulas, not all of which are permanent. 1. Temporary fistula: for example, after trauma to the intestines, the abdominal cavity is contaminated, and a one-stage anastomosis cannot be done, so it may be necessary to do a temporary fistula first, and then perform a two-stage fistula for restitution after recovery from the trauma. 2. Permanent fistula: most of fistula surgery is permanent, such as low colorectal cancer, because the tumor is close to the anus, it is impossible to keep the anus after removing the tumor, so permanent fistula is needed. In bladder cancer, after surgical removal of bladder, some of them also need permanent fistula. Therefore, whether the fistula is permanent or not depends on the purpose of the surgery and the recovery situation, you can consult the surgeon in detail.