This document discusses appendicitis, including its causes, symptoms, diagnosis, and treatment. The appendix is a small pouch connected to the cecum in the digestive system. Appendicitis occurs when the appendix becomes blocked and infected, causing swelling. Common symptoms include abdominal pain localized to the lower right side, nausea, loss of appetite, and fever. Doctors use physical exams, blood tests, imaging like CT scans, and ultrasounds to diagnose appendicitis and rule out other potential causes of abdominal pain. Untreated appendicitis can lead to a burst appendix, so surgical removal of the inflamed appendix (appendectomy) is usually required to treat appendicitis.