During 1971-1980, 128 patients were hospitalized at the Clinic of Occupational Diseases, Institute of Occupational Medicine, Lódź, for disease resulting from chronic exposure to organic solvents. The authors analyzed diseases syndromes, exposure duration prior to the disease occurrence, and professions and workplaces constituting sources of exposure to solvents. Most significant in occupational health were found to be: benzene and its homologues, chlorinated hydrocarbons and naphtha. However, exposure to solvents occurs not only in industry but also in small service and cottage--work workshops, which fairly hampers preventive measures.