The present work aims to investigate the concept of trauma in psychoanalysis, as well as therapeutic regression as a way to elaborate the unrepresentable traumatic event through the analytical situation. To achieve this goal, on the first part of this work, we will analyze the notion of trauma from Sándor Ferenczi s perspective, considering the theoretical course that allowed him to formulate de idea of a trauma constituted in two times, from a confusion of tongues. On the second part, we will follow the direct and indirect unfolding of this theory in the English School of Psychoanalysis, represented by two authors belonging to the independent group: Donald W. Winnicott and Michael Balint. We shall explore then the primitive psychic functioning of the individual and the role played by the environment on the subjective constitution, as well as the severe environmental flaws and their pathogenic functions, i. e. the repercussions of the trauma understood as a catastrophic event that disrupts the emotional development. On the third part we will enter a clinical discussion, recognizing the principles that shape the analytical setting, comprehending the different uses of interpretations and the clinical manifestations of regression as a new opportunity to liquidate and elaborate the traumatic material. Lastly we shall examine the contemporary psychoanalysis suggestions over the ideas of the psychoanalysis of breakdown, by Christopher Bollas; the analytic third, by Thomas H. Ogden; and the psychoanalytic empathy, by Stefano Bolognini, show new concepts over the clinic of trauma and about how to handle regressive cases in the current psychoanalytic thought.