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Definition

By Mayo Clinic staff

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Illustration showing inflamed appendix Appendicitis

Appendicitis is a condition in which your appendix becomes inflamed and fills with pus. Your appendix is a finger-shaped pouch that projects out from your colon on the lower right side of your abdomen. This small structure has no known essential purpose, but that doesn't mean it can't cause problems.

Appendicitis causes pain that typically begins around your navel and then shifts to your lower right abdomen. Appendicitis pain typically increases over a period of 12 to 18 hours and eventually becomes very severe.

Appendicitis can affect anyone, but it most often occurs in people between the ages of 10 and 30. The standard appendicitis treatment is surgical removal of the appendix.

Symptoms
References
  1. Ben-David K, et al. Appendicitis. In: Feldman M, et al. Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-1-4160-6189-2..X0001-7--TOP&isbn=978-1-4160-6189-2&about=true&uniqId=229935664-2192. Accessed June 23, 2011.
  2. Appendicitis, acute. In: Ferri FF. Ferri's Clinical Advisor 2011: Instant Diagnosis and Treatment. Philadelphia, Pa.: Mosby Elsevier; 2011. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-0-323-05610-6..C2009-0-38600-6--TOP&isbn=978-0-323-05610-6&about=true&uniqId=230100505-53. Accessed June 23, 2011.
  3. Appendicitis. National Institute of Diabetes and Digestive and Kidney Diseases. http://digestive.niddk.nih.gov/ddiseases/pubs/appendicitis/. Accessed June 23, 2011.
  4. Appendectomy. American College of Surgeons. http://www.facs.org/public_info/operation/brochures/app.pdf. Accessed June 23, 2011.
DS00274 Aug. 13, 2011

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