Sarcoidosis is a disease that can affect any organ in the body.
The lung is the most common organ involved with sarcoidosis. The eyes, skin, and lymph glands are also commonly involved. Sarcoidosis can also affect the liver, spleen, brain, nerves, heart, bones, muscles, and joints. Sarcoidosis can also cause generalized body symptoms such as fever, weight loss, night sweats, and fatigue. The symptoms caused by sarcoidosis depend on which organs are involved.