After anal fissure surgery, you need to wait for the incision to heal completely before you have a painless bowel movement, which is usually about 3-4 weeks after surgery. Most anal fissure surgical incisions are open incisions, and open incisions take a long time to heal due to the daily stimulation of defecation, with complete healing occurring 3-4 weeks after surgery. Before the incision is completely healed, the open incision will be stimulated by feces and pulling during defecation, resulting in painful symptoms that are sometimes severe and sometimes mild. Of course, most post-operative patients have the most obvious pain symptoms within one week after surgery, and the pain symptoms will be gradually relieved from one week after surgery, and after two weeks, it will only show a slight pain during defecation.