Anorectal conditions affect the anus and rectum and include hemorrhoids, anal fissure and anal fistulas. Hemorrhoids occur when your veins or blood vessels in the lower rectum and anus become red and swollen. Most people experience hemorrhoids at some point.
Anal fissures are tears or cracks in the anus that result from stretching the anal canal beyond its normal capacity. An anal fistula is an opening in the skin near the anus that leads into a blind pouch or may connect through a tunnel with the rectal canal. Most anal fistulas form in reaction to an anal gland that has developed a pus-filled infection (abscess).