Anal pain during defecation is clinically most common in anal fissure, which occurs mainly due to weakened peristalsis, resulting in feces in the colon lumen where water is fully absorbed, and when defecating with intense force, the dried fecal matter damages the rectum and mucosa of the anal canal to form a fissure. Generally speaking, there will be transient pain during defecation, a small amount of blood will drip after defecation, followed by a period of severe pain for about 15-30 minutes. For anal fissure, usually the acute stage is mainly used conservative treatment, that is, soften the stool, eat more vegetables, fruits and other high-fiber foods, to keep the stool loose and smooth, the anus can be 1:5000 potassium permanganate sitz bath, as well as local trauma smear, petroleum jelly and other emulsions to protect the mucosa. If the acute stage is not cured, and the chronic stage is formed, it is usually necessary to perform surgery, and the treatment usually includes anal fissure excision, and even the internal anal sphincter is cut off in order to get cured.