The appendix is a small finger-shaped tube that branches off the first part of the large intestine. The appendix can become inflamed or infected causing pain in the lower right part of the abdomen.
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.