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Causes

By 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
  • 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.

Complications Symptoms
References
  1. Rectal problems. The American College of Gastroenterology. http://www.acg.gi.org/patients/women/rectal.asp. Accessed Oct. 21, 2010.
  2. Bleday R, et al. Clinical features of hemorrhoids. http://www.uptodate.com/home/index.html. Accessed Oct. 21, 2010.
  3. Bleday R, et al. Treatment of hemorrhoids. http://www.uptodate.com/home/index.html. Accessed Oct. 21, 2010.
  4. Corigliano MA. Hemorrhoids. In: Ferri FF. Ferri's Clinical Advisor 2011. St. Louis, Mo.: Mosby; 2010. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-0-323-05610-6..00017-2--sc0075&isbn=978-0-323-05610-6&sid=1071600329&type=bookPage&sectionEid=4-u1.0-B978-0-323-05610-6..00017-2--sc0075&uniqId=223412356-4#4-u1.0-B978-0-323-05610-6..00017-2--sc0075. Accessed Oct. 21, 2010.
  5. Sneider EB, et al. Diagnosis and management of symptomatic hemorrhoids. Surgical Clinics of North America. 2010;90:17.
  6. Christoforidis D, et al. Hemorrhoids, anal fissure, and anorectal abscess and fistula. In: Bope ET, et al. Conn's Current Therapy 2010. 61st ed. Philadelphia, Pa.: Saunders Elsevier; 2009. http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-1-4160-6642-2..00007-7--sc0045&isbn=978-1-4160-6642-2&sid=1071600329&type=bookPage&sectionEid=4-u1.0-B978-1-4160-6642-2..00007-7--s0835&uniqId=223412356-4#4-u1.0-B978-1-4160-6642-2..00007-7--s0835. Accessed Oct. 21, 2010.
  7. Cataldo P, et al. Practice parameters for the management of hemorrhoids (revised). Arlington Heights, Ill.: American Society of Colon and Rectal Surgeons. http://www.guideline.gov/content.aspx?id=7284. Accessed Oct. 21, 2010.
  8. Picco MF (expert opinion). Mayo Clinic, Rochester, Minn. Nov. 3, 2010.
DS00096 Dec. 23, 2010

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