Appendicitis means that the vermiform appendix of the large intestine is inflamed. It is about the size of a little finger and is located in the ascending part of the colon. It plays virtually no role in digestion, but is thought to help protect intestinal bacteria.
Approximately 7% of the population, mostly between the ages of 10-30, experience appendicitis. This makes appendicitis the most common disease of the abdomen requiring surgery.