Complications and risks of anal fissure

Complications and Risks of Anal Fissure

A simple anal fissure is a small injury, and left alone it usually stays one. But an untreated or chronic fissure has a recognisable set of complications - most uncomfortable rather than dangerous, with a few exceptions, per NHS guidance on anal fissure.

The Common Complications

• Chronicity: the acute tear becomes an established chronic ulcer with fibrosed edges - harder to treat and slower to heal
• Sentinel tag: a permanent small skin tag at the fissure's outer end. Harmless in itself, but it can itch, irritate, and hold moisture
• Anal spasm cycle: persistent sphincter spasm reduces local blood flow, which delays healing, which maintains spasm - the loop that keeps chronic fissures alive
• Recurrence: a fissure that healed over a hard-stool patch returns with the next one
• Avoidance behaviour: fear of pain leading to toilet avoidance, worsening constipation - a complication of behaviour, not anatomy, and a real one

The Less Common, More Serious Ones

• Perianal abscess: the tear becomes infected and collects pus - fever, throbbing swelling, needs urgent drainage
• Anal fistula (fistula-in-ano): an infected fissure occasionally burrows a tract into surrounding tissue. Classical texts knew this as Bhagandara and treated it as a distinct surgical disease
• Anal stenosis: repeated scarring narrows the canal, making motions progressively difficult - classical Guda-samkrocha

The Risk That Is Actually About Something Else

The most important "risk of a fissure" is misattribution: assuming every anal bleed or pain is a fissure. Crohn's disease, infections, hemorrhoids, polyps and cancer can all present nearby. Any of these features should move you from home care to examination:

• Fissure off the midline, or several fissures
• Bleeding that is dark, heavy, or mixed with stool
• Weight loss, fever, changed bowel habit
• No healing after 6-8 weeks of proper treatment
• New anal bleeding after age 40

Frequently Asked Questions

Can an anal fissure turn into cancer? No - a simple fissure does not become cancer. The caution runs the other way: something that is not a fissure can be mistaken for one, which is why non-healing fissures get examined.

Will the sentinel tag go away? Usually not on its own. It is harmless; if it bothers you, it can be removed during fissure surgery.

Can a fissure cause permanent damage? Untreated for a long time, scarring can narrow the canal (stenosis) - one more reason not to live with a chronic fissure for months.

Is it dangerous to delay treatment? For a typical acute fissure, a few weeks of home care is reasonable. Delay becomes costly when the fissure turns chronic or when a different diagnosis hides behind the assumption.