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Hemorrhoids, also known as piles, are the dilatation, the stretching beyond normal dimensions of radicles of rectal veins inside the anal canal. In this instance a radicle is the smallest branch of a blood vein. Veins are weak compared to arteries due to their thin walls, therefore veins can become strained and twisted with any great back pressure. Veins have one-way valves to prevent back flow. The three rectal veins are named accordingly superior, middle and inferior rectal veins. Obstructions or pressure increase in these veins cause hemorrhoids. Piles, or hemorrhoids, come in two types, internal and external. External hemorrhoids are outside the anus and are skin covered. Their color may be brown or black. Because nerves are so abundant in the anal area an external hemorrhoid is extremely painful. The second type, internal hemorrhoids are in the interior of the anal canal, internal to the anus. They are purple or red and have a mucous membrane covering. They are usually painle