Jul 6, - Appendicitis is an inflammation of the appendix, a finger-shaped pouch that projects from your colon on the lower right side of your abdomen. The appendix doesn't seem to have a specific purpose. Appendicitis causes pain in your lower right abdomen. However, in most people, pain begins around the navel and then moves. Sep 25, - Appendicitis is a painful condition that occurs when the appendix Older adults and pregnant women may also experience different symptoms.