This brief contribution on GD, the first behavioral addiction, makes evident how gambling can be placed along a continuum whose extremes are represented by recreational play and pathological behavior. Individuals with GD would express a complex syndrome characterized by multiple psychopathological symptoms and different phenotypes that also involved in other mental disorders: it is from these considerations that the term dual disorders was proposed. The identification of other mental disorders in association with gd should not be limited to the diagnostic categories of the dsm-5, but addressed in a transdiagnostic perspective, including personality traits, such as impulsivity, which represent specific phenotypes and endophenotypes that allow gambling dual disorder to be described as a brain and neurodevelopmental disorder.