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, nausea, vomiting, fever, and loss of appetite. A physical exam may reveal tenderness at McBurney's point. Blood tests and imaging studies like ultrasound or CT scan can help diagnose appendicitis. Treatment is surgical removal of the appendix (appendectomy) which is usually performed laparoscopically. Nursing care focuses on relieving pain, preventing infection and complications, and ensuring adequate nutrition during recovery.