“Sarcoidosis is considered a rare disease. There are usually fewer than 200,000 cases of sarcoidosis at any given time in the U.S.

Research suggests that a combination of genetics and environmental factors cause sarcoidosis, but its exact cause is unknown. We think certain people are more likely to have their immune system overreact to certain triggers (antigens), like bacteria and viruses. Despite the immune system’s involvement, sarcoidosis isn’t considered an autoimmune disorder.

Since we don’t know for sure which combination of genes and triggers causes sarcoidosis, it’s impossible to predict who will get it.”

Cleveland Clinic (https://my.clevelandclinic.org/health/diseases/11863-sarcoidosis#:~:text=Sarcoidosis%20is%20a%20condition%20that%20causes%20your%20immune%20system%20to,fibrosis%2C%20causing%20permanent%20lung%20scarring.)