Overall, there appear to be 20 cases per 100,000 in cities on the east coast and somewhat fewer in rural locations. Some scientists, however, believe that these figures greatly underestimated the percentage of the U.S. population with sarcoidosis. Sarcoidosis mainly affects people between 20 to 40 years of age. White women are just as likely as white men to get sarcoidosis, but the black female gets sarcoidosis two times as often as the black male. No one knows what causes sarcoidosis.
Sarcoidosis also appears to be more common and more severe in certain geographic areas.
It has long been recognized as a common disease in Scandinavian countries, where it is estimated to affect 64 out of 100,000 people. What Sarcoidosis is Not Much about sarcoidosis remains unknown. Nevertheless, if you have the disease, you can be reassured about several things. Sarcoidosis is usually not crippling. It often goes away by itself, with most cases healing in 24 to 36 months.