CausesBy Mayo Clinic staff
The 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
- Anal intercourse
- Low-fiber diet
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.
- Living with hemorrhoids. American Gastroenterological Association. http://www.gastro.org/patient-center/digestive-conditions/hemorrhoids. Accessed April 15, 2013.
- Bope ET, et al. Conn's Current Therapy. Philadelphia, Pa.: Saunders Elsevier; 2013. http://www.mdconsult.com/books/about.do?about=true&eid=$eid&isbn=978-1-4557-0295-4&uniqId=398813857-1936. Accessed April 15, 2013.
- Ferri FF. Ferri's Clinical Advisor 2013: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2012. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-0-323-08373-7..00002-9&isbn=978-0-323-08373-7&about=true&uniqId=343863096-23. Accessed April 15, 2013.
- Hemorrhoids. National Institute of Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/hemorrhoids/. Accessed April 15, 2013.
- Daram SR, et al. Anorectal bleeding: Etiology, evaluation and management (with videos). Gastrointestinal Endoscopy. 2012;76:406.
- Mounsey AL, et al. Hemorrhoids. American Family Physician. 2011;84:204.
- Bleday R, et al. Treatment of hemorrhoids. http://www.uptodate.com/home. Accessed April 16, 2013.
- Rivadeneira DE, et al. Practice parameters for the management of hemorrhoids (revised 2010). Diseases of the Colon & Rectum. 2011;54:1059.
- Rivadeneira DE, et al. Outpatient and surgical procedures for hemorrhoids. http://www.uptodate.com/home. Accessed April 16, 2013.