Complex post-traumatic stress disorder (CPTSD) was adopted as a new diagnosis in ICD-11. Trauma-focused cognitive–behavioural therapy (CBT) is effective in treating PTSD but with CPTSD being a recently defined diagnosis, the evidence for its effectiveness in that disorder is not as clear, but it is still promising. This article reviews the diagnosis, psychopathology and some key differential diagnoses, and looks at the two CBT approaches that are currently used in clinical practice: the phase-oriented approach and the unimodal approach. The key aims of this article are to clarify the concept of CPTSD, its differentiation from borderline personality disorder and prominent comorbidities, how it develops and how CBT is used to treat it.
