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Hemorrhoids

Definition:
Hemorrhoids are dilated (enlarged) veins in the lower portion of the rectum or anus.

Alternative Names:
Rectal lump; Piles; Lump in the rectum

Causes, incidence, and risk factors:

Hemorrhoids are very common, especially during pregnancy and after childbirth. They are caused by increased pressure in the veins of the anus. The most common cause is straining during bowel movements. Constipation, prolonged sitting during bowel movements, and anal infection may also contribute to the development of hemorrhoids. In some cases they may be a manifestation of other diseases, such as liver cirrhosis.

Internal hemorrhoids occur near the beginning of the anal canal, and external hemorrhoids occur at the anal opening. They may protrude outside the anus.



Review Date: 12/27/2002
Reviewed By: Hebe Molmenti, M.D., Ph.D., Private Practice specializing in Plastic and Reconstructive Surgery, Baltimore, MD. Review provided by VeriMed Healthcare Network.

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