The purpose of this thesis is to analyse and articulate the concepts of trauma, repetition and death drive in Freud, although some contributions of post-freudian psychoanalysts will also be considered. The richness of these concepts can be sustained by the following paradox: they witness a limit of the psychic apparatus, at the same time that lances it for work. What motivates this research, therefore, is precisely the question about the vicissitudes of these limits - limits of the psyche and representation, in order to discuss them. One must always think about a dual capability that presents itself as a limit: one for the power of opening, and the other as a closing agent. This is not to diminish the importance of the representation in an analytical work as an essential goal, but to point out the importance of the valuation and discrimination of other working modes of the psyche rather than a representational work, in order to emphasize the importance of negativity for the enrichment and complexity of the psyche.