In this article the definition of trauma is discussed. At the beginning trauma is a medical term and has the signification of bodily injuries caused by an external factor. But as a result on research on the aetiology of neurosis, the concept of psychological trauma was developed. Sigmund Freud, who was inspired by Charcot's theses on trauma, developed a theory of neurosis with emphasis on the notion of sexual trauma caused during childhood. Childhood sexual trauma creates some important effects on the economic, topographical and dynamic levels of adult psychic life.