After anal fistula surgery generally need sitz bath about 2 to 8 weeks before you can stop, depending on the patient’s wound healing. The purpose of the postoperative sitz bath is to clean the wound area, disinfection, and promote the wound to heal as soon as possible, generally need to continue until the wound is completely healed, so the specific sitz bath time is variable, if the patient is a low anal fistula, generally need to be about 2 weeks, if it is a high level of fistula, then need to be 4 to 8 weeks. If the fistula in the anal fistula patients in the external anal sphincter of the deep below, and the number of fistula is less, that is, belong to the low anal fistula, then the operation is relatively simple, the postoperative wounds are relatively shallow, so the healing time required is relatively short, generally only need to sit in the bath for about 2 weeks. If the anal fistula patient’s fistula is located in the deeper part of the external anal sphincter above, and there are more than one fistula, that is, belongs to the high level of anal fistula, then the operation is relatively large trauma, the wound after the operation is also relatively deep, so the wound healing time required is longer, most need 4 to 8 weeks. It is recommended that the anal fistula patients should be under the guidance of the doctor, the specific bath time should also follow the doctor’s instructions.