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1). Hemorrhoids. Causes, symptoms, prevention, treatment. Hemorrhoids, often called piles, are swollen and inflamed veins in and around the anus and lower rectum. They are much like varicose veins you might see on a person's legs. Hemorrhoids are a very common health problem. Hemorrhoids cause serious problems in about 4% (over 10 million) of people in the United States. Prevalence of hemorrh...