Does an anal fistula require surgery?

Written by Deng Heng
Colorectal Surgery
Updated on January 19, 2025
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The treatment of anal fistula mainly focuses on surgical treatment, with medication as a secondary support. This means that without surgery, an anal fistula essentially cannot heal. Non-conservative treatments for anal fistulas are only temporary symptomatic treatments that manage the condition and alleviate clinical symptoms. For example, during an acute attack of an anal fistula, anti-inflammatory drugs can be used to temporarily relieve symptoms such as pain. Therefore, surgery is necessary for anal fistulas, as surgical treatment can completely eradicate the source of the disease, addressing the internal and external origins of the fistula for a complete cure.

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Written by Yang Dong
Colorectal Surgery Department
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How long does it take for the rubber band of an anal fistula to fall off?

For high anal fistulas, we opt for the seton therapy, where we typically use rubber bands as the thread. For the rubber bands used in seton therapy, we believe it is best if they fall off around ten days. Therefore, for the anal fistula rubber bands, we think it is ideal if they fall off in about two weeks at the latest. If they have not fallen off after about two weeks, we may consider further interventions such as cutting the thread or directly cutting the sphincter muscle.

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Written by Yang Dong
Colorectal Surgery Department
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Consequences of recurrent anal fistulas

If an anal fistula is not treated in time, it may repeatedly occur. If an anal fistula repeatedly occurs, due to local inflammation, pus will spread and infiltrate into the perianal tissues, causing further aggravation of infection. This can then affect the function of the anus, potentially leading to symptoms such as fecal incontinence. Moreover, if an anal fistula repeatedly occurs over a long period, there is a possibility of malignant transformation.

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Written by Chen Tian Jing
Colorectal Surgery
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Symptoms of cancerous transformation in anal fistula

The vast majority of anal fistulas do not undergo malignant transformation. However, there is a possibility of cancerous changes if an anal fistula that has repeatedly recurred over a long period is not treated aggressively, or if the inflammation of the fistula tract is severe. When an anal fistula undergoes malignant transformation, the secretion from the local fistula tract increases and is accompanied by a foul smell, and there may even be ulceration of the local fistula tract mucosa. Further surgical procedures, such as fistulotomy with seton placement, are required, and the excised fistula tract suspected of high-grade malignant transformation should be sent for pathological examination. If malignant transformation is confirmed, further pelvic MRI examinations are necessary to determine whether there is local and surrounding lymph node metastasis.

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Written by Yang Dong
Colorectal Surgery Department
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Is the probability of anal fistula turning into cancer high?

An anal fistula, formed due to an anal gland infection, carries a higher risk of malignant transformation if the infection and inflammation are recurrent and persistent, particularly over a long period exceeding five years. Therefore, it is strongly recommended that anal fistulas exceeding five years should be given sufficient attention and surgical treatment should be pursued promptly to prevent malignancy.

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Written by Chen Tian Jing
Colorectal Surgery
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How long does it take to recover after surgery for an anal fistula?

After surgery for an anal fistula, the general recovery time is about twenty days to a month. The duration of recovery mainly depends on the size of the local lesion before surgery, as well as the surgical wound postoperatively, and also relates to the patient's constitution. Particularly, if the patient has certain underlying diseases, such as diabetes or a history of tuberculosis, the recovery time may be relatively extended. The wound after an anal fistula surgery is an open wound contaminated with bacteria, so postoperative wound dressing changes are very important for wound recovery. It is recommended that the secretion from the local wound be cleared daily, followed by disinfection with povidone-iodine, then application of an anti-inflammatory ointment, and covering the wound with an oil gauze strip for drainage to avoid poor drainage leading to false healing of the local wound.