How is an anal fistula treated?

Written by Chen Tian Jing
Colorectal Surgery
Updated on January 17, 2025
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The treatment methods for anal fistula mainly involve surgery. Conservative medication for anal fistula does not provide a definitive cure but can alleviate the inflammatory symptoms triggered during acute episodes by using anti-inflammatory symptomatic drugs. The surgical method primarily used for anal fistula is the fistulotomy with seton placement. This procedure involves cutting the local sphincter either partially or completely using a thread, while preserving the function of the surrounding sphincter and thoroughly removing the fistula tract wall to further eliminate the local lesions. After the surgery, due to the large wound area, it is recommended that patients stay in the hospital for dressing changes and symptomatic treatment to avoid complications like poor healing leading to pseudo-healing or wound infection. (Medication should be used under the guidance of a doctor.)

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Written by Yang Dong
Colorectal Surgery Department
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What are the symptoms of an anal fistula?

Anal fistula is one of the common diseases in proctology. The most typical symptom of anal fistula is recurrent anal induration, accompanied by swelling, pain, and pus discharge, often with a ruptured external opening. During the quiescent phase, a hard cord can be felt leading from the ruptured external opening to the inside of the anus; during the acute inflammatory phase or abscess phase, pressing may cause pus to ooze from the ruptured opening.

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Written by Chen Tian Jing
Colorectal Surgery
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Best treatment method for anal fistula abscess

The best treatment method for anal fistula and perianal abscess is surgical treatment, which is also the only curative method. Conservative treatment using drugs alone can only alleviate local inflammatory symptoms and cannot achieve complete cure. The main surgical method is the cutting and threading technique. This involves threading and ligating the infected area and the sphincter muscle. Through the slow cutting and drainage action of the ligature, the infection focus is removed while protecting the anal sphincter. Postoperatively, it is also important to pay attention to disinfecting and draining the local wound, ensuring proper dressing changes, and preventing poor drainage that could lead to infection or recurrence. It is advised that patients avoid spicy and irritating foods for the first six months after surgery.

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Written by Chen Tian Jing
Colorectal Surgery
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When will the anal fistula seton fall off?

After the diagnosis of an anal fistula, it is necessary to perform surgery on the anal fistula as soon as possible. The main surgical method for anal fistula is the fistulotomy with seton placement, which uses an elastic band to indirectly cut the local sphincter. The time for the elastic band to fall off mainly depends on the amount of sphincter involved and the depth of the anal fistula location. If it is a simple anal fistula, the band typically falls off about a week after placement. For high, complex fistulas, or if multiple elastic bands are used, the time may extend to ten or even twelve days. If the band does not fall off after the surgery, and the local sphincter has regenerated, a professional colorectal surgeon can cut the band. However, it is important to ensure that the local sphincter is not damaged before proceeding.

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Written by Chen Tian Jing
Colorectal Surgery
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Do anal fistulas need surgery even if there are no symptoms?

After the formation of an anal fistula, it does not always lead to acute episodes over a long period. Acute episodes of an anal fistula, causing infectious symptoms, occur only when there is a severe localized damp-heat condition. Therefore, the symptoms of an anal fistula are intermittent. The absence of symptoms does not mean that the anal fistula is completely cured or will not recur. Therefore, if an anal fistula is diagnosed, it is necessary to undergo surgical treatment as soon as possible to avoid repeated episodes due to lack of active treatment. Long-term repeated episodes of an anal fistula can lead to thickening of the fistula wall and an increase in branching. Even if an anal fistula is not actively treated over many years, it may even induce carcinogenesis in the local fistula wall.

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Written by Deng Heng
Colorectal Surgery
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Can anal fistulas be contagious?

An anal fistula is a pathological channel that forms a connection between the anal canal, rectum, and the skin around the anus. It primarily develops from an infection causing a perirectal abscess around the rectal anal canal. These infections are generally purulent, with a smaller number due to tuberculosis. Other specific infections, such as Crohn's disease or ulcerative colitis, can also lead to anal fistulas. Generally, such infections are caused by Escherichia coli, leading to purulent infections; tuberculosis can be contagious, but generally, it is not infectious or contagious.