http://www.wellutah.com wellutah.com - Guide Appendix http://www.wellutah.com/custom/content_files/img_logo_rss.gif http://www.wellutah.com http://www.wellutah.com/article/what-is-appendicitis.html Obstruction of the appendiceal lumen causes appendicitis. Mucus backs up in the appendiceal lumen, causing bacteria that normally live inside the appendix to multiply. As a result, the appendix swells and becomes infected. http://www.wellutah.com/article/what-is-appendicitis.html http://www.wellutah.com/custom/image_files/photo_113.jpg 60 83