Appendicitis is an inflammation of the appendix, a pouch connected to the large intestine (colon) on the lower right hand side of the abdomen. Around 7% of people in the UK will experience appendicitis during their lives. Appendicitis is a medical emergency that requires prompt surgery to remove the appendix - called an appendectomy. Left untreated, an inflamed appendix can burst, leading to serious or fatal complications, such as blood poisoning. Follow the links below to find BootsWebMD's comprehensive coverage about appendicitis, the symptoms it causes, how it’s treated, and much more.