Complex trauma occurs repeatedly and escalates over its duration. In families, it is exemplified by domestic violence and child abuse and in other situations by war, prisoner of war or refugee status, and human trafficking. Complex trauma also refers to situations such as acute/chronic illness that requires intensive medical intervention or a single traumatic event that is calamitous. Complex trauma generates complex reactions, in addition to those currently included in the DSM‐IV (American Psychiatric Association, 1994) diagnosis of posttraumatic stress disorder (PTSD). This article examines the criteria contained in the diagnostic conceptualization of complex PTSD (CPTSD). It reviews newly available assessment tools and outlines a sequenced treatment based on accumulated clinical observation and emerging empirical substantiation. Complex trauma refers to a type of trauma that occurs repeatedly and cumulatively, usually over a period of time and within specific relationships and contexts. The term came into being over the past decade as researchers found that some forms of trauma were much more pervasive and complicated than others (Herman, 1992a, 1992b). The prototype trauma for this change in understanding was child abuse. The expanded understanding now extends to all forms of domestic violence and attachment trauma occurring in the context of family and other intimate relationships. These forms of intimate/domestic abuse often occur over extended time periods during which the victim is entrapped and conditioned in a variety of ways. In the case of child abuse, the victim is psychologically and physically immature—his or her development is often seriously compromised by repetitive abuse and inadequate response at the hands of family members or others on whom he or she relies for safety and protection. The expanded understanding also extends to other types of catastrophic, deleterious, and entrapping traumatization occurring in childhood and/or adulthood, for example, ongoing armed conflict and combat, POW status, and the displacement of populations through ethnic cleansing, refugee status, and relocation and through human trafficking and prostitution. It might also result from situations of acute and chronic illness that require ongoing and intensive (and often painful) medical intervention or may even result from a single catastrophic trauma, for example, witnessing the sudden traumatic death of another individual or experiencing a brutal gang rape.
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