This volume presents a comprehensive overview of childhood trauma, considering the psychopathological definition and its neurobiological implications as well as its impact on different psychiatric disorders. The focus on childhood trauma rather than that occurring in adulthood is important due to its general “neuro-psyco-socio” and its specific biological implications, since trauma during childhood impacts directly on neurodevelopment. It has been suggested that early life stress increases vulnerability to psychiatric disorders; however, the exact mechanisms of this association are not yet completely understood. Although childhood trauma could be considered too unspecific to be an important risk factor for individual psychiatric disorders since it seems to occur across the board, it impacts differently on different psychiatric disorders, and it can modulate their clinical expression. Therefore, the assessment of early trauma needs to be included in the clinical evaluation of patients with psychiatric disorders. The volume will be an invaluable tool for psychiatrists, helping them to select suitable pharmacological, psychotherapeutic and rehabilitative treatments.