People with sarcoidosis may have no symptoms at all. Or they may have serious problems with many organs in their body. The cause of sarcoidosis isn't known. It is most common in adults between 20 and 40 years of age.
Sarcoidosis is more common in women than in men.
In the United States, it occurs more often in blacks than in whites. Sarcoidosis is not contagious. You can't catch sarcoidosis from another person who has the disease. The symptoms of sarcoidosis vary, depending on which part of the body is affected. Symptoms can involve several parts of the body, or only one.