It is almost impossible to tell the specific reasons for Sarcoidosis to appear. Perhaps, it is passed on the genetic level. Maybe, it is the consequence of specific bacteria, viruses, or metal/chemical dust interaction. The problem develops as the granulomas progress in the lungs or other affected body parts. Thus, the chosen organ starts working in a wrong manner, causing such discomfort. Immune system hardly copes with the problem. Even though the exact causes are not known, doctors have defined risk factors of Sarcoidosis.