Hemorrhoids are swollen but normally present blood vessels in and around the anus and lower rectum that stretch under pressure, similar to varicose veins in the legs.
The increased pressure and swelling may result from straining to move the bowel. Other contributing factors include pregnancy, heredity, aging, and chronic constipation or diarrhea.
Hemorrhoids are either inside the anus (internal) or under the skin around the anus (external).
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