Hemorrhoids or Piles is caused due to inactivity and constipation. They are caused by a blood vessel that has been pushed out of the anus and become infected. They are often felt and seen as a tiny lump of grapes arising from the anus. The size, shape and number of hemorrhoids vary from one person to another. CharacteristicsThe size of hemorrhoid can be larger than a grape or the size of a walnut. The most standard and commonly found is typically the size of a pea.