Whether the anal fistula is serious or not can not be generalized, need to be analyzed on a case-by-case basis, generally based on the location of the fistula, the number of branches, whether or not the sphincter is damaged, time and frequency to judge. It is recommended to go to the hospital in time and follow the doctor’s instructions for treatment. 1. If the location of the anal fistula is low, the branches are few, and there is no damage to the anal sphincter, the fistula can be timely to the hospital after the occurrence of fistula, in this case, the fistula is not serious, usually through a simple surgery can be cured. 2. The higher the location of the fistula, the greater the trauma produced during surgery, easy to damage the anal sphincter, easy to incontinence after surgery. The more branches it has, the more traumatic the operation will be, and the slower the healing after the operation. Anal fistula occurs for a long time and more often, easy to lead to the lesion site of the tissue of chemosis, the emergence of tumor cells, cancer. These cases of anal fistula are more serious. It is recommended that once the anal fistula patients are diagnosed, they should go to the hospital, improve the examination, and carry out reasonable and standardized treatment under the guidance of the doctor to avoid aggravation of the condition.