Anal fissure is divided into acute stage and chronic stage, the healing time of acute anal fissure is usually 3 to 5 days, while chronic anal fissure needs more than 7 days. 1. Acute anal fissure: the main reason for anal fissure is that fecal matter is too dry and too hard leading to defecation difficulties, which causes rupture of the rectal and anal mucosa. Acute anal fissure is usually treated conservatively, which can cure the clinical symptoms. Conservative treatment measures are mainly to eat more fresh vegetables and food to keep the stool soft and smooth. Oral lactulose to soften the stool, local use 1:5000 potassium permanganate sitz bath, generally acute stage of laceration healing time in 3 to 5 days. 2. Chronic anal fissure: For chronic anal fissure, surgical excision is usually needed to cure it. If the wound is deeper and lasts longer, it may even require cutting off the internal anal sphincter to heal. Chronic anal fissure is treated by surgical excision, and it takes 7 days or more for the local wound to heal. Patients with anal fissures should seek prompt medical attention and proper treatment under the guidance of a professional doctor.