Psychological trauma has developed into a very common concept in the scientific community, in mental health care, as well as in popular language and mass media. The purpose of this article is to show the relevance of the discipline of traumatic stress studies to the field of public mental health by examining central concepts and findings concerning trauma and its aftermath and examining implications for public mental health.

Traumatic loss involves the loss of loved ones in the context of potentially traumatizing circumstances and is a commonly reported traumatic event. It may give rise to disturbed grief, called prolonged grief disorder (PGD) in ICD-11 and persistent complex bereavement disorder (PCBD) in DMS-5, combined with posttraumatic stress disorder (PTSD) and depression. The recent inclusion of grief disorders in both DSM-5 and ICD-11 have spurred research on grief-related psychopathology. This special issue on traumatic loss includes 10 articles and two letters.

Background and objectives: Major negative life-events including bereavement can precipitate perceived positive life-changes, termed posttraumatic growth (PTG). While traditionally considered an adaptive phenomenon, it has been suggested that PTG represents a maladaptive coping response similar to cognitive avoidance. To clarify the function of PTG, it is crucial to establish concurrent and longitudinal associations of PTG with post-event mental health problems. Yet, longitudinal studies on this topic are scarce. The present study fills this gap in knowledge.

Objective
Posttraumatic stress disorder (PTSD) is frequently associated with depression and anxiety, but the nature of the relationship is unclear. By removing mood and anxiety diagnostic criteria, the 11th edition of the International Classification of Diseases (ICD‐11) aims to delineate a distinct PTSD phenotype. We examined the effect of implementing ICD‐11 criteria on rates of codiagnosed depression and anxiety in survivors with recent PTSD.