Appendicitis By Parswa Ansari, MD, Hofstra Northwell-Lenox Hill Hospital, New York Reviewed / Revised Apr 2023 View Patient Education Etiology Symptoms and Signs Diagnosis Treatment Prognosis Key Points Topic Resources Acute Appendicitis Overview of Appendicitis Appendicitis is acute inflammation of the vermiform appendix, typically resulting in abdominal pain, anorexia, and abdominal tenderness.