Anal Fistula Surgery: Causes, Treatment Options and Recovery

What Causes Anal Fistulas?

To understand the causes of anal fistula development, it helps to know a little about the local anatomy. Inside the anus, there are several small glands that produce fluid. Occasionally, these small glands become blocked, which can lead to a buildup of bacteria and the formation of an infected pocket of tissue known as an abscess.

If this abscess bursts or is surgically drained, the healing process may leave a small tunnel connecting the infected gland inside the anus to an opening on the skin around the buttocks. This abnormal tunnel is known as an anal fistula.

While a previous abscess is the most common trigger, other underlying factors can contribute to the development of a fistula, such as:

• Inflammatory bowel diseases, particularly Crohn’s disease, which cause chronic inflammation of the digestive tract
• Specific infections or sexually transmitted conditions
• Previous trauma or surgical complications in the anorectal region
• Conditions like tuberculosis or diverticulitis, though these are less common causes in the UK

Treating Anal Fistulas

When conservative measures fail or an abscess repeatedly returns, proper anal fistula treatment becomes necessary. Anal fistulas rarely heal without clinical intervention. Ignoring the problem usually leads to recurring infections, increased pain, and the potential for more complex medical issues over time.

Anorectal surgery is typically required to close the tract and prevent further infection. The primary goal of any treatment plan is to heal the fistula completely whilst protecting the delicate sphincter muscles, which are responsible for bowel control. Our consultants will carefully assess the depth and position of the fistula tract before recommending the safest and most effective approach.

Anal Fistula Surgical Options

Modern medicine offers several effective techniques for anal fistula surgery, ranging from traditional methods to advanced, minimally invasive fistula treatment. The right choice depends on the complexity of your condition. Options include:

• Fistulotomy – This is the most common and straightforward procedure for fistulas that don’t pass through a significant portion of the sphincter muscle. A surgeon cuts open the whole length of the fistula to allow it to heal from the inside out into a flat scar. This approach boasts a very high success rate.
• Seton Procedures – If the fistula tract crosses a large amount of muscle tissue, a fistulotomy might carry a risk of incontinence. Instead, a surgeon may place a piece of surgical thread, called a seton, through the fistula, allowing the tract to drain continuously and heal slowly over several weeks or months.
• Minimally Invasive Fistula Treatment – For some patients, less invasive options are highly effective. Techniques such as the LIFT (Ligation of Intersphincteric Fistula Tract) procedure, laser ablation, or the use of surgical glues and plugs can close the internal opening without cutting the sphincter muscle. These treatments often result in a faster return to normal activities.

The Fistula Recovery Process

Healing from anorectal surgery requires patience and adherence to your medical team’s advice. The fistula recovery process varies from person to person, depending on the type of surgery performed and the complexity of the original fistula.

Immediately after the procedure, it’s normal to experience some discomfort, swelling, and light bleeding. Your medical team will provide specific guidance during your recovery, but you can generally expect:

• Pain Management – You’ll be prescribed or advised on appropriate painkillers. Taking them as directed will keep you comfortable, especially during the first few days.
• Hygiene and Wound Care – Keeping the area clean is crucial for preventing infection and promoting healing. You may be advised to take warm sitz baths several times a day and after bowel movements.
• Dietary Adjustments – To avoid straining when going to the toilet, you’ll need to keep your stools soft. Drinking plenty of water and eating a diet rich in fibre – such as fruits, vegetables, and whole grains – is highly recommended. Sometimes, a gentle laxative is prescribed to assist with this.
• Rest and Activity – While resting is important initially, light walking can help promote blood circulation. You should avoid heavy lifting, strenuous exercise, and prolonged sitting until your surgeon confirms it’s safe.