Appendicitis is an acute inflammation of the appendix, a small pouch attached to the large intestine, and is considered a medical emergency. It typically occurs when the appendix becomes blocked by stool, infection, or swelling, leading to bacterial overgrowth and increased internal pressure. Symptoms often begin with vague abdominal discomfort near the navel that shifts to sharp pain in the lower right abdomen, accompanied by fever, nausea, vomiting, and loss of appetite. If left untreated, the inflamed appendix can rupture, spreading infection within the abdominal cavity and causing serious complications. Prompt diagnosis and treatment—usually surgical removal of the appendix, sometimes along with antibiotics—are essential to prevent rupture and ensure recovery.