Appendicitis is a condition in which the appendix becomes inflamed and filled with pus, causing pain.
Appendicitis begins with pain near the belly button and then moves to the right side. This is often accompanied by nausea, vomiting, poor appetite, fever and chills.
Appendicitis is usually treated with surgery and antibiotics. If untreated, the appendix can rupture and cause an abscess or systemic infection (sepsis).