Anxiety is a well defined symptom in psychiatric field, but also a concept that refers to the theoretical and epi-stemological visions of the theories on the psychical functioning. The present work shows, in the first part, a brief description of the evolution of the anxiety concept, highlighting the several meanings of this word; particularly, is wanted to show off how in the modern psychodynamic points of view anxiety is tightly linked to the role of the "relationship" in the "personality forming". The second part shows a synthetic historical picture of the main psychoanalytic theories on this topic.