Future challenges of occupational health services (OHS) in a changing working world

From a historical and ideological viewpoint, there has been a dramatic transformation in the nature of work, working style and work-related stress. As these changes continue to evolve, it is necessary to detect tasks changing with the times, provide interventional services by taking in results from studies, including those in related scientific fields, and verify the results of the intervention. The important issues in occupational safety and health are (1) establishment of a service system for all workers, (2) continuous review of occupational health service (OHS) content depending on the social condition and (3) introduction of new evidence and evaluation. Development and introduction of the indices displaying the degree of health and the marker for predicting future condition is essential for the promotion of workers' health.