Peritonitis is an inflammation of the peritoneum, or the tissue that lines the inner wall of the abdomen and that covers and supports most of your abdominal organs. Peritonitis is usually caused by infection from bacteria or fungi and can lead to death, if untreated.
Peritonitis is an inflammation of the lining of the abdominal cavity usually caused be a wound or injury or burst appendix, it is very often fatal if not treated by antibiotics.