Hemorrhoids, more commonly called "piles," are swollen blood vessels that occur on the anus (It is the opening through which the fecal matter is getting out from the body) and within the lower rectum. It is painful but it is not a grave problem. Many people have hemorrhoids due to too much pressure on the veins in the pelvic and rectal area.
Hemorrhoids are a common problem which may occur for both men and women. The most common symptoms of hemorrhoids are rectal bleeding, itching, and pain.
Anus consists of tissues which fill with blood for helping the bowel movement. If you are sitting in the toilet for longer period for bowel movement or pressurizing it, it causes large amount of blood to flow through the veins and makes it to swell leading to hemorrhoids.