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Causes
By Mayo Clinic staffThe veins around your anus tend to stretch under pressure and may bulge or swell. Swollen veins — hemorrhoids — can develop from an increase in pressure in the lower rectum. Factors that might cause increased pressure include:
- Straining during bowel movements
- Sitting for long periods of time on the toilet
- Chronic diarrhea or constipation
- Obesity
- Pregnancy
- Anal intercourse
It's also possible to inherit a tendency to develop hemorrhoids. Hemorrhoids are more likely as you get older because the tissues that support the veins in your rectum and anus can weaken and stretch with aging.
- Hemorrhoids. American Society of Colon & Rectal Surgeons. http://www.fascrs.org/patients/conditions/hemorrhoids. Accessed Dec. 1, 2008.
- Hemorrhoids. American Gastroenterological Association. http://www.gastro.org/frame-templates/print_template.cfm. Accessed Dec. 1, 2008.
- Hemorrhoids. National Digestive Diseases Information Clearinghouse. http://digestive.niddk.nih.gov/ddiseases/pubs/hemorrhoids. Accessed Dec. 1, 2008.
- Kaidar-Person O, et al. Hemorrhoidal disease: A comprehensive review. Journal of the American College of Surgeons. 2007;204:102.
- Bleday R. Patient information: Hemorrhoids. http://www.uptodate.com/home/index.html. Accessed Nov. 16, 2008.
- Acheson AG, et al. Management of haemorrhoids. British Medical Journal. 2008;336:380.
- Bleday R, et al. Clinical features of hemorrhoids. http://www.uptodate.com/home/index.html. Accessed Nov. 17, 2008.
- Cataldo P, et al. Practice parameters for the management of hemorrhoids (revised). Diseases of the Colon and Rectum. 2005;48:189.
- Bleday R, et al. Treatment of hemorrhoids. http://www.uptodate.com/home/index.html. Accessed Nov. 17, 2008.
