[The role of psychosomatic medicine in public health (hygieiology): an approach for lifestyle-related disease].

In the twenty-first century it has been hypothesized that lifestyle-related disease will account for more than 70% of all disease; thus, in the twenty-first the prevention and treatment of lifestyle-related disease will be of primary importance. Lifestyle differs from individual to individual. In the past preventive medicine has targeted groups while clinical medicine has dealt with disease. However, in the twenty-first century it will be necessary to integrate the two approaches to meet the needs of the individuals. Measures following the primary prevention of lifestyle-related disease will be the vital and they can only be delivered by primary care medicine. As a model that covers the prevention and treatment of lifestyle-related diseases, based on the conventional biomedical model, a systematic medical model that attaches importance to the relativity of all factors and individuality will be necessary. The medical model for psychosomatic medicine is the Bio-psycho-socio-ethical (ecological) model, and psychosomatic medicine has specific methods for implementing this model. We have used this perspective to explain the role of psychosomatic medicine in public health (hygieiology).