Dilated blood vessel: Hemorrhoids occur when the cushions of blood vessels at the anus enlarge or dilate. Many things can cause this, including straining at the toilet or sitting on the toilet for a long time. Pregnancy or other conditions that cause blood to pool in the lower part of the body can contribute to the formation of hemorrhoids. There are many treatments for hemorrhoids depending on the exact type.
Answered 7/30/2015
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