Freud proposed his reinterpretation of clinic hysteria in terms of the transfer of the hysteria question from the point of view of the observer that classifies or investigates the body, to the point of view of the listener. Since someone is ready to listen to it, hysteria ceases to be a espectacle and changes into a discourse that may be interpreted. The need to classify in differentiated entities according to its symptomatology resuIts in problems related to interpretation and to the securities that may offer the psychoanalytic methodology. The response to these questions is mainly raised from an ethical point of view rather than technical prescriptions that should supposedly secure the purity of interpretation.