1 WORK: basis and foundation of individual and social life. It is the activity through which man relates to nature to transform and develop itself. The worker as a fundamental part of the production process can be exposed to conditions that can affect it positively or negatively. Therefore it is said that work can become an instrument both d health and disease. 3.2 Relations HEALTH 'WORK In 1946 the World Health Organization WHO, presents a new concept of health by giving a more holistic conception of human being because it involves the physical, mental and social human being.