[Freudian trauma].

An exploration of all Freud's writings on trauma from 1885 is proposed. Trauma, a central concept in his first works, always kept a place in his theory. He conceived it as a consequence of an external perception leading to a sudden affect which cannot be mastered by the psyche. For him, the excitation is so strong that it threatens the ego and provokes a breach of the protective shield. The idea that he would have renounced to this topic at the end of the nineteenth century is irrational.