Sarcoidosis is a disease in which swelling (inflammation) occurs in the lymph nodes, lungs, liver, eyes, skin, or other tissues.
The cause of the disease is unknown. In sarcoidosis, clumps of abnnormal tissue (granulomas) form in certain organs of the body. Granulomas are clusters of immune cells.
The disease can affect almost any organ of the body, but it most commonly affects the lungs.
Possible causes of sarcoidosis include: