Anal fistula

An anal fistula is a small abnormality in the anal region.

An anal fistula is a small channel that develops between the end of the bowel and the skin near the anus. It’s usually caused by an infection near the anus resulting in a collection of pus (abscess) in the nearby tissue. An anal fistula can also occur after surgery to drain an anal abscess.

Flexible sigmoidoscopy

A flexible sigmoidoscopy is a procedure to look inside the rectum and lower part of your bowel.


A colonoscopy is a procedure to look at the lining of the back passage (rectum) and large bowel (colon).

Excision of anal fistula

The surgical removal of an anal fistula

What next?

If you are suffering with a suspected condition, you should seek the advice of your doctor who will be able to refer you to Benenden Hospital for diagnosis and treatment.

There are four ways to access treatment at Benenden Hospital which include self-funding, using private medical insurance or your Benenden membership, or through the NHS e-Referral scheme.