Complications and Risks of Fistula

Anal fistula is not usually life-threatening, but it can cause lasting problems if not properly treated.

Complications of the fistula itself

• Recurrent abscesses. The tunnel can block and the infection can return again and again.
• Spread of infection into surrounding tissue (cellulitis) or, rarely, into the blood
• Chronic discharge and skin irritation, affecting hygiene and daily life
• More complex tracts. Repeated infection can branch the tract and make later surgery harder.
• Pain and reduced quality of life, including problems with sitting and intimacy
• Rarely, cancer can develop in a long-standing fistula

Complications of treatment

• Incontinence. Surgery that cuts too much sphincter muscle can cause leakage of gas or stool. This is why the tract type and surgeon's skill matter.
• Recurrence. Some fistulas return after surgery, especially complex ones.
• Delayed healing, bleeding, infection or scarring
• Harm from unregulated treatment. Unlicensed procedures and home preparations can cause infection or damage the muscle.

Higher risk groups

• People with Crohn's disease
• People with diabetes or weak immunity
• People with tuberculosis
• Those with multiple or high tracts

Warning signs

• Severe pain and swelling with fever
• Spreading redness
• Heavy bleeding
• Unable to pass stool or urine
• New leakage of stool

Seek same-day care. Call 112 or 102 in an emergency.

Reducing risk

Early assessment, treating abscesses promptly, choosing a qualified surgeon, treating underlying disease and following up all lower the chance of complications.