Treating complex trauma

The short version: the evidence for treating complex trauma is a patchwork of small studies, single cases, and a single systematic review—none of it funded by a disinterested party, and most of it too thin to call proven.

The 2025 systematic review of psychological interventions for complex PTSD is the strongest piece here [6]. It covers six studies across children, adolescents, and adults. Trauma-focused CBT in children showed medium-to-large effects on disturbances in self-organization (affective dysregulation, negative self-concept, relationship problems). In adults, a trauma-and-body group therapy improved body awareness and anxiety but did not significantly change PTSD symptoms. An online mindfulness intervention reduced PTSD and negative self-concept but not affective dysregulation. Prolonged exposure and STAIR (skills training) both outperformed a supportive control for CPTSD symptoms at one year. The review is recent and systematic, but it synthesizes only six studies, most with small samples, and the field has no large, independently funded, long-term trial comparing these approaches head-to-head against a true placebo or untreated group.

The single-case and small-series evidence is suggestive but not proof. Therapeutic Assessment for complex bereavement showed a transient worsening during the active phase followed by improvement in depression (PHQ-9 from 19 to 12) [4]. EMDR case reports claim complete resolution of olfactory reference syndrome in 1–3 sessions with 5–10 year follow-up [15], and large drops in PTSD scores in parents of ill children [16]. A single EMDR session reduced heart rate and skin conductance during trauma recall in six PTSD patients [18]. These are striking anecdotes, but they are anecdotes. No large RCT of EMDR for complex PTSD appears in this retrieval. The Gestalt therapy case [13] and the REBT group trial in Nigerian undergraduates [10] are similarly small and population-specific.

The evidence does not include a single large, independently funded, long-term RCT comparing any complex-trauma treatment to a true untreated control. The systematic review [6] is the best available guide, but it rests on six studies. The case reports show that some people improve dramatically with some approaches, but they do not tell you who will benefit, how often, or at what cost. The burden of proof has not been met for any single protocol.

My call: the evidence supports trying trauma-focused CBT or skills-based therapy (STAIR) for complex PTSD, but the data is too thin to call any approach proven. Confidence: low.