The start point of this dissertation is the freudian s considerations about sexuality like a special factor in production of anguish. The conception that sexuality is traumatic demonstrates the fact anguish is associated with something beyond the psyche s capacity to symbolization. The approach about Hans case introduces the connection between sexuality and anguish. The clinical case shows that castration is the danger indicated by anguish. The concept of castration appears in the comments about the experience of estrangement, where it become clear that the function of anguish is associated the body s image too. So, anguish isn t an external part of I. The story The Sandman , written by Hoffmann, exemplifies the idea that there is something in a place not included in body s image, but that is part of its structure. The object a is that place, simultaneously strange and familiar, and its subjective expression is anguish. The study about the function of anguish on direction of treatment is sustained by the concept of object a, wich is very important in the theory of Lacan.