Worldwide it affects 1 – 2 in every 10,000 people, however in Ireland it affects 1 – 2 in 1,500 people.
It is most often diagnosed in young adults between the ages of 20 and 40 years although it can also affect older and younger people. It affects both sexes, but is more common amongst women.
Sarcoidosis affects all races. The disease is however more prevalent amongst those of African American, Irish, German, Puerto Rican and Scandinavian origin.