Anal leakage of stool may be caused by the sequelae of anorectal surgery, nerve damage, hemorrhoids and anorectal ring damage. 1. Anal surgery sequelae: anal surgery treatment to remove the skin of the anal canal and the surrounding tissue is too much, it will cause deeper scar, and then cause the anal closure is incomplete. 2. Nerve damage: perineal nerve and central nerve damage can also cause the nerves innervating the anus to lose normal function, causing anal leakage of stool. 3. Hemorrhoids: for example, severe prolapse or prolapse of internal hemorrhoids may also cause relaxation of the anal sphincter, which in turn causes anal leakage of feces. 4. Damage to the anorectal ring: anorectal surgery or trauma causes the anorectal ring to be cut off, which in turn leads to the loss of anal sphincter function, causing anal fecal leakage. It is recommended that patients go to regular hospitals to receive examination, according to the results of the treatment, do not use drugs privately, so as not to cause danger.