Piles or hemorrhoids are nothing but the swollen vein around the anus. Your food pipe starts from mouth and ends at anus region. The last part of your food pipe is called large intestine. The large intestine starts from colon to rectum and ends at anus. The veins situated at the lower part of rectum and anus, if swollen is called piles or hemorrhoid. If the veins get swollen at the lower part of rectum, it is called internal piles or internal hemorrhoid. If the veins get swollen at the anal region under the skin, it is called external piles or external hemorrhoids. Swelling occurs if there is increase of pressure in the veins that causes the veins to swell up and engorged with blood. The all symptoms of piles are due to the increased pressure in the veins situated at the rectum and anal region.
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