You may need medicine to help a chronic anal fissure heal.

The most common treatment of chronic anal fissure is surgical intervention.

Nitroglycerin is usually the first medicine used to treat a chronic anal fissure.

The main surgery for chronic anal fissure is lateral internal sphincterotomy.

Non-surgical treatments are recommended initially for acute and chronic anal fissures.

Another study showed that lateral internal sphincterotomy was better than nitroglycerin cream at healing chronic anal fissures.

Lateral internal sphincterotomy is the preferred method of surgery for persons with chronic anal fissures, and is generally used when medical therapy has failed.

Sacral nerve stimulation offers an effective alternative treatment option for chronic anal fissure in patients who chose not to pursue more invasive surgical interventions.

Randomized clinical trial comparing botulinum toxin injections with 0.2 per cent nitroglycerin ointment for chronic anal fissure.

Lateral internal sphincterotomy is an operation performed on the internal anal sphincter muscle for the treatment of chronic anal fissure.

Efficacy and safety of botulinum toxin A injection compared with topical nitroglycerin ointment for the treatment of chronic anal fissure: A prospective randomized study.

She was diagnosed with chronic anal fissure and had already used pharmacological treatments which she suffers with headache, incontinence of flatus and the recurrence of the disease.

Lateral internal sphincterotomy is superior to topical nitroglycerin for healing chronic anal fissure and does not compromise long-term fecal continence: Six-year follow-up of a multicenter, randomized, controlled trial.