Article presents the development of psychosomatic medicine, respectively that of behavioral or anthropological medicine, stressing they do not belong to medical disciplines but they represent a way of thinking, which aims to introduce knowledge of humanistic sciences into the classical medicine and to change the orientation of contemporary medicine from the disease to the diseased person. Historically, the new approach represents a systemic course, which leads to the general theory of systems and to cybernetics. These are mathematical and logic sciences, which can be applied in every situation where complex manifestations have to be handled. Problems of human health and disease definitely represent such complexity. Systemic theories also develop as well as their implementation into the medicine. Formulation of the bio-psycho-social approach or the movement of family (systemic) therapy verifies the theory.

        Key words: systemic approach, general theory of systems, cybernetics, bio-psycho-social approach, family (systemic) therapy.