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.
Update Date 7/22/2011
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.