In psychology, Posttraumatic growth (PTG) is a concept describing positive psychological change experienced as a result of struggling with highly challenging, highly stressful life circumstances. These circumstances represent significant challenges to the adaptive resources of the individual, and pose significant challenges to the individual's way of understanding the world and their place in it. Posttraumatic growth involves "life-changing" psychological shifts in thinking and relating to the world and the self, that contribute to a personal process of change, that is deeply meaningful.