Post-Traumatic Stress Disorder (PTSD)

An anxiety disorder developed after a confrontation with a traumatic event. The core features of PTSD are the persistence of intense, distressing, and fearfully avoided reactions to reminders of the triggering event, alteration of mood and cognition, a pervasive sense of imminent threat, disturbed sleep, and hypervigilance. PTSD belongs to a category, called “Trauma- and Stressor-Related Disorders”; avoidance has been added as one of the required “diagnostic clusters,” negative cognitions are highlighted, and traumatic events are not defined by an initial reaction of fear, horror, or helplessness.

Reference:
Shalev, A., Liberzon, I., & Marmar, C. (2017). Post-Traumatic Stress Disorder. The New England Journal of Medicine, 376(25), 2459-2469.

Delrue, N., & Plagnol, A. (2017). Post-traumatic stress disorder in Alzheimer's disease. Counselling Psychology Review, 32(4), 58-69.