Anal stricture
Anal stricture (also called anal stenosis) is a medical problem that is not common; it may be congenital (a baby is born with a medical problem), but usually if it does happen it is after anorectal surgery, which is surgery in the area of the rectum and anus. This may cause stricture (when a passage in the body becomes too narrow) of the anal canal, which leads to hard or painful bowel movements.   When anal stenosis does occur it is usually after a hemorrhoidectomy, which is the surgical removal of hemorrhoids; this is the cause in 90% of cases of anal stenosis.