Appendicitis is an inflammation of the appendix, a small pouch connected to the large intestine. It most often affects people between ages 10-30. Symptoms include pain in the lower right abdomen that worsens over time and becomes severe. A physical exam and tests like a CT scan can diagnose appendicitis. Treatment involves antibiotics and surgery to remove the appendix (appendectomy), which is usually performed laparoscopically. Complications can occur if the appendix ruptures, leading to infection in the abdomen.