In fairness to appendicitis, it dates back to the 1800s and the medical profession only stopped speaking Latin at the end of the 1700s. The English lay term is

In fairness to appendicitis, it dates back to the 1800s and the medical profession only stopped speaking Latin at the end of the 1700s. The English lay term is probably something like "bursten belly" that would also cover everything from hernias to intestinal rupture.