What is serositis?

Serositis refers to inflammation of the serosae; the serosal membranes, also called serous membranes, that line the walls of body cavities. The serosae are thin membranes that secrete fluid into enclosed cavities to reduce friction of structures, and lubricate opposing surfaces.

Some examples of serosal membranes include:

- The pericardium, the serosa of the heart. Pericarditis is the term for inflammation of the serosa of the heart, which may cause chest pain and shortness of breath.

- The pleura, the serosa of the lungs. Pleuritis or pleurisy refers to inflammation of the pleura, which can cause chest pain and labored breathing.

- The peritoneum, the serosa of the abdomen and pelvis. Peritonitis is the term for inflammation of the serosa of the abdominal and pelvic cavities, which may cause abdominal pain, fever, and impaired bowel function.