When analysing the data on sarcoidosis in Eastern Europe, it is seen that the incidence of sarcoidosis considerably varies in respect to individual countries, as is also the case in West Europe. The highest incidence was observed in GDR (12.0) and the lowest one in Poland (1.26). Data on the incidence could be obtained for Hungary (4.3), Czechoslovakia (3.5) and Yugoslavia (2.5), while for the Soviet Union, Romania, Turkey (Istanbul), Bulgaria and Greece there are only data for certain districts, with the exception of Albania where these data are thoroughly unknown. In all countries of Eastern Europe, sarcoidosis generally appears in persons aged 29-50, predominantly in the group of those aged 29-40. In respect to sex, the disease is more frequently diagnosed in women, the incidence of which ranges from 53% in Lithuanian SSR to 69.5% in Hungary. Acute forms (Löfgren's syndrome) account for 9% in Poland and 24% in Yugoslavia.