Source:http://linkedlifedata.com/resource/umls/id/C0019112
MSH: Swollen veins in the lower part of the RECTUM or ANUS. Hemorrhoids can be inside the anus (internal), under the skin around the anus (external), or protruding from inside to outside of the anus. People with hemorrhoids may or may not exhibit symptoms which include bleeding, itching, and pain.,NCI: An enlarged or swollen blood vessel, usually located near the anus or the rectum.,MEDLINEPLUS: <p>Hemorrhoids are swollen, inflamed veins around the <a href='http://www.nlm.nih.gov/medlineplus/analdisorders.html'>anus</a> or lower <a href='http://www.nlm.nih.gov/medlineplus/rectaldisorders.html'>rectum</a>. They are either inside the anus or under the skin around the anus. They often result from straining to have a bowel movement. Other factors include pregnancy, aging and chronic <a href='http://www.nlm.nih.gov/medlineplus/constipation.html'>constipation</a> or diarrhea.</p><p>Hemorrhoids are very common in both men and women. About half of all people have hemorrhoids by age 50. The most common symptom of hemo