What is the medical term for inflammation of the membrane lining the abdominal cavity?

The correct term for inflammation of the membrane lining the abdominal cavity is peritonitis. This condition specifically refers to the inflammation of the peritoneum, the extensive membrane that covers the abdominal organs and lines the abdominal wall. Peritonitis can result from various causes, including infection, injury, or illness, and it requires prompt medical attention due to the potential for serious complications.

On the other hand, appendicitis refers specifically to the inflammation of the appendix, which is a small pouch connected to the large intestine. Gastritis describes inflammation of the stomach lining, while hepatitis indicates inflammation of the liver. Each of these terms applies to different organs and specific conditions, making peritonitis the most appropriate choice in this context.