Piles, also known as hemorrhoids ( Mulvyadh / Bavasir ), are enlarged veins located at the junction of the rectum and anus.

At the junction of the rectum and anus, there is a natural cushion of tissue and veins, which, along with the the sphincter muscle, is responsible for the complete closure of the anus and prevents any leakage. During a bowel movement these cushions become smaller to allow stools to pass. We all have them, and problem only arises when they become enlarged due to pressure on them. An increased pressure due to any reason, causes them to enlarge and swell, thus forming lumps which are occasionally felt at the anal opening.