Appendicitis is an inflammation of the appendix that most commonly affects adolescents and young adults. It is usually caused by a blockage in the appendix from stool, parasites, or other debris. Common symptoms include abdominal pain localized to the lower right side of the abdomen. A physical exam may reveal tenderness at McBurney's point. Blood tests typically show an elevated white blood cell count. Imaging studies like ultrasound or CT scan can confirm the diagnosis. Treatment is an appendectomy to surgically remove the appendix before it ruptures. Nursing care focuses on relieving pain, preventing infection and complications, and ensuring proper recovery post-operation.