When Does an Anal Fissure Require Surgery?

Anal fissures may require surgery when they become chronic or when other treatments fail to promote healing.

An anal fissure is a small tear in the skin lining the anal canal. The condition often causes pain during and after bowel movements and may lead to bleeding. Treatment aims to control symptoms, facilitate bowel movements, and allow the fissure to heal.

What is the Initial Treatment for an Anal Fissure?

Initial treatment typically includes measures to keep stools soft and reduce straining during bowel movements. A fiber-rich diet, adequate fluid intake, and warm sitz baths may be part of this approach.

Topical medications may also be used. Some ointments help relax the anal sphincter, which is the muscle responsible for controlling the opening and closing of the anus. Relaxation reduces pressure in the area and can promote healing.

Topical calcium channel blockers and nitrates are among the medications used in the treatment of chronic anal fissures. Botulinum toxin may also be used in selected patients to temporarily reduce anal sphincter contraction.

Why Might Surgery Be Necessary?

Surgery may be considered when a chronic anal fissure persists despite adequate treatment. Selected patients with chronic fissures may also receive a surgical indication after individualized evaluation.

In chronic anal fissures, the internal anal sphincter may remain excessively contracted. Increased pressure reduces blood flow to the area and hinders wound healing. This mechanism helps maintain a cycle of pain, muscle contraction, and difficulty healing.

The decision to operate also considers sphincter function and the risk of continence changes. A history of anorectal surgery, obstetric injury, or previous continence alteration may influence treatment choice.

How Does Anal Fissure Surgery Work?

Lateral internal sphincterotomy is one of the main surgical techniques used in the treatment of chronic anal fissures. The procedure involves a controlled division of part of the internal anal sphincter.

Reducing sphincter pressure improves conditions for fissure healing. The American Society of Colon and Rectal Surgeons guideline reports healing rates between 88% and 100% in the evaluated studies.

What to Expect from Recovery After Surgery?

Recovery after anal fissure surgery varies according to each patient’s progress. Pain caused by the fissure may improve before healing is complete.

Post-surgery care includes keeping stools soft, avoiding excessive straining during bowel movements, and performing regional hygiene as directed by a doctor. Follow-up allows for assessment of healing and identification of possible complications.

Surgery is not necessary for all anal fissures. The duration of symptoms, response to previous treatments, and sphincter characteristics help define when surgical treatment should be considered.