Hemorrhoids are known by the name of piles. They are the bulging and dilated veins of the anus and the rectum which is caused when the pressure is increased in the rectal veins. The blood vessels which lined the anus are involved in hemorrhoids. Muscles which support the hemorrhoid vessels become weak due to pressure on the walls of the rectum. There are two types of hemorrhoids. They are internal hemorrhoids and external hemorrhoids. Internal hemorrhoids are sac like protrusion inside the rectal canal whereas external hemorrhoids are around the anus inside the skin.
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