What are hemorrhoids?

The term hemorrhoids refers to a condition in which the veins around the anus or lower rectum are swollen and inflamed.

Hemorrhoids may result from straining to move stool. Other contributing factors include pregnancy, aging, chronic constipation or diarrhea, and anal intercourse.

Hemorrhoids are either inside the anus (internal) or under the skin around the anus (external).

Illustration reprinted with permission from the American Society of Colon and Rectal Surgeons. Artist: Russell K. Pearl, M.D.

source: http://digestive.niddk.nih.gov/ddiseases/pubs/hemorrhoids/index.htm