An anal fistula is almost always caused by a perianal abscess, a collection of pus near the anal canal, that does not heal completely. The abscess leaves behind an abnormal tunnel connecting the inside of the anal canal to the skin surface. Unlike piles or fissures, an anal fistula does not resolve on its own and requires surgical treatment.
Written by Dr Moksha Gowda, MBBS, DNB (General Surgery), Consultant General, Laparoscopic and Proctology Surgeon, NiSH Clinic, 48, 7th B Main Rd, 4th Block, Jayanagar, Bengaluru 560011.
