If you are experiencing a medical emergency please dial 911 immediately
Appendicitis is a common reason for belly pain. It happens when the appendix becomes infected and inflamed.
Your appendix is a small, finger-shaped sac that is attached to your large intestine. Experts do not know what the appendix does in the body. Most of the time it does not cause problems.
Last Revised: April 1, 2013
Author: Healthwise Staff
Medical Review: Anne C. Poinier, MD - Internal Medicine & H. Michael O'Connor, MD - Emergency Medicine
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