A fistula is an abnormal tunnel between 2 bodily structures. An anal fistula occurs when a tunnel develops between the rectum or anal canal and the skin of the buttocks or other organs.
Fistulas are caused by damage to local tissue. It is often associated with cysts or infections of anal glands. A fistula can also be caused by sores, ulcers, or other injuries. It may develop at the same time as these injuries or weeks after infections clear.
In some people, anal fistulas occur spontaneously without any specific cause.
Certain conditions increase the risk of developing anal fistulas:
An anal fistula may cause:
You will be asked about your symptoms and medical history. A physical exam will be done. Generally, a diagnosis can be made by examining the skin around the anus for any abnormalities.
To learn more details your doctor may suggest:
If your fistula is caused by an infection or chronic health condition, it may need to be managed before the fistula is repaired. Talk with your doctor about the best treatment plan for you.
A fistula is only cured with surgical repair. Left untreated, some fistulas can cause repeat abscesses or infections. Depending on the severity or location of the fistula, surgery may be straightforward or may need to be done in stages.
Surgical procedures include:
Some procedures may affect muscles that open and close the anus. Depending on your treatment, you may have some degree of fecal incontinence.
Medication may help manage pain and treat any infection. Stool softeners, fiber, or bulk laxatives may also be recommended to decrease strain during bowel movements.
American College of Gastroenterology
American Society of Colon and Rectal Surgeons
Canadian Association of Gastroenterology
Abcarian H. Anorectal infection: Abscess-fistula. Clin Colon Rect Surg. 2011;24(1):14-21.
Anal abscess/fistula. American Society of Colon & Rectal Surgeons website. Available at: https://www.fascrs.org/patients/disease-condition/abscess-and-fistula-expanded-information. Updated October 2012. Accessed December 16, 2014.
Anal fistula. John Hopkins Medicine website. Available at: http://www.hopkinsmedicine.org/healthlibrary/conditions/adult/digestive_disorders/anal_fistula_134,173. Accessed December 16, 2014.
Fistula-in-ano. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T115485/Fistula-in-ano-and-perianal-abscess. Updated January 29, 2016. Accessed October 3, 2016.
Rojanasakul A. LIFT procedure: a simplified technique for fistula-in-ano. Tech Coloproctol. 2009;13(3):237-240.
van Onkelen RS, Gosselink MP. Is it possible to improve the outcome of transanal advancement flap repair for high transsphincteric fistulas by additional ligation of the intersphincteric fistula tract? Dis Colon Rectum. 2012;55(2):163-166.
Last reviewed December 2015 by Daus Mahnke, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.