Anal Fissures Healing Guide

Anal fissures are small cuts or tears in the sensitive skin of the anal canal, often causing sharp, tearing pain and bright red blood. They commonly occur in the back midline, which has naturally less blood flow. Fissures are categorized as acute (less than 6 weeks) or chronic (more than 6 weeks). The condition becomes chronic due to a vicious cycle where pain causes the internal anal sphincter muscle to spasm, cutting off blood flow needed for healing. First-line treatment involves conservative measures like increasing fiber/water intake, using stool softeners, and employing warm sitz baths to relax the spasm. Medical treatments are designed to break the cycle by relaxing the muscle; topical calcium channel blockers (like nifedipine cream) are considered the first-line medical treatment due to their effectiveness and fewer side effects compared to nitrates. For stubborn chronic fissures, the definitive surgical solution is a Lateral Internal Sphincterotomy (LIS), which is called the gold standard by the American Society of Colon and Rectal Surgeons and boasts success rates of 88 to 100%.