An anal fissure is a linear tear in the skin of the distal anal canal below the dentate line. It is a common condition affecting all age groups but particularly common in young adults men and women are equally affected. The classical symptoms are of anal pain during or after defaecation and the passage of bright red blood per anus. The surgery, called a lateral internal sphincterotomy (lis), involves making a small cut in the anal sphincter muscle. when you are discharged from the hospital, this is what to expect after anal fissure surgery, regarding the medicines you will be prescribed, which include. Topical medicine to relax your anal muscle and increase blood circulation in the area. Some of these medicines also have anesthesia to relive your pain, which should only last for two to three days after surgery. anal fissures, or tears in the mucous membranes supporting the anus, are very common, painful problems. Most fissures are small and temporary, generally responding well to home remedies and medications. A fissure can become a chronic nuisance for some people, however, and surgery may be recommended as a permanent cure. Anal fissure (fissures) is a very painful condition caused by trauma to the anus and anal canal, which then cuts or tears the anus and anal canal tissue. These tears can be caused by straining to have a bowel movement, hard stools, and chronic episodes of diarrhea. Symptoms include rectal bleeding, anal itching, and painful bowel movements. Surgery is a highly effective treatment for a fissure and recurrence rates after surgery are low. Surgery usually consists of a small operation to cut a portion of the internal anal sphincter muscle (a lateral internal sphincterotomy). 6 in every 100 persons experience fissure again after surgery. Alternative medical treatments or further surgery might be recommended by your doctor. an anal fissure is a tear of the squamous epithelium that usually extends from the dentate line to the anal verge. In 90 of cases, the fissure manifests as a painful linear ulcer lying in the posterior midline of the anal canal.