Introduction One of the most common and serious problems in the practice of Occupational Health Services (OHS) are musculoskeletal diseases.

The aim The aim of this study was to clarify the subjective impression of OHS for diseases generating the most frequent and long-term sick leaves from work and representing the most serious health problems for workers.

Methods We implemented online based and direct survey of OHS from the official Register of the Ministry of Health (the total number of OHS there was 495), the questionnaire consists of 18 questions. We received 77 completed questionnaires, statistically analysed with SPSS 11.1. A special attention was paid on the questions &x2116; 12 A, 12 B and 15. The respondents could give more than one answer.

Results It was found that the diseases generating the most frequent sick leave were the diseases from Class X(diseases of the respiratory system), followed by Class IX (diseases of the circulatory system) and Class XIII (diseases of the musculoskeletal system and connective tissue), n = 74 – IX-11 ( 14.86%), X-68 (91.89%), XIII-9 (12.16%). The diseases that generate long-term sick leave were leaded by the diseases Class II, IX, XIX XIII, n = 69, II-40 (57.97%), IX-36 (52.17%), XIII-15 (21.74%), XIX-20 (28.99%).

The most serious health problems of workers related to their work (question &x2116;15), according to OHS are diseases of the musculoskeletal system and connective tissue – 32 (50.79%), diseases of the circulatory system – 28 (31.75%) and Nervous System – 20 (31.75%), n = 63.

Conclusion The results confirm the importance of musculoskeletal disorders in occupational pathology and point to the use of all achievements of science to reduce them in cooperation of the whole healthcare system.