The hanging thread of the anal fistula fell off on the sixth day generally do not need to be particularly worried about, is a normal phenomenon, but if accompanied by discomfort, should be timely review. Generally speaking, the hanging thread in the anal fistula surgery can fall off by itself in about 1 week to 10 days after the operation, so it is a normal phenomenon to fall off on the sixth day, generally do not need to worry too much. However, if you feel the wound area has redness, swelling, poor healing, etc., it is recommended to consult a doctor for timely examination, under the guidance of a professional doctor to give symptomatic treatment. Hanging thread therapy in anal fistula refers to the use of rubber bands or medicinal threads of mechanical compression, cutting effect, slowly cut the anal fistula method. This therapy is suitable for 3 to 5cm from the anal verge, there are internal and external orifices of low or high simple anal fistula, or as an adjunct to complex anal fistula incision, excision, its operation is relatively simple, less bleeding, drainage is more adequate, but also play a role in the protection of the anal sphincter. Anal fistula hanging line on the sixth day fell off, it is recommended to change the medication to communicate with the doctor in charge of the condition of the recovery, follow the doctor’s instructions to implement.