An appendicectomy, is a surgery to remove the appendix. The appendix is a small pouch that is located on the lower right hand side of the abdomen and is attached to the large intestine. It often varies in length, width and position. It is thought to have served a purpose in the digestive process at some point in our ancestral past, but its present functionality is not completely known.
We do not need our appendix as it performs no obvious day-to-day functions within the body. Present thinking now postulates that the appendix serves some sort of function in maintaining a healthy balance of gut-bacteria in the large intestine but this is just speculation at present. What is known is that a human can undergo an appendix removal without it impacting their health. The incidence of appendicitis is 1.1 cases per 1000 people per year.