Trauma and addiction: the research is clear
Somewhere between 60% and 80% of people seeking addiction treatment report significant trauma histories. For women in treatment the figure is consistently above 80%. Trauma doesn't just co-occur with addiction, in most cases it precedes it, often by years or decades. The substance use began, in many cases, as the most effective self-medication strategy the person had available at the time.
The neurobiological connection is well established. Trauma, particularly repeated or early trauma, dysregulates the stress response system, impairs emotion regulation, disrupts the brain's capacity for trust and connection, and alters the dopamine reward system in ways that overlap almost entirely with addiction neurobiology. Treating addiction without addressing underlying trauma typically produces what clinicians call "dry drunk" outcomes: abstinence without genuine recovery, with high relapse risk as unprocessed trauma continues to drive the need for relief.
Complex trauma and addiction
Complex PTSD, now recognised in ICD-11, results from repeated, prolonged traumatic experiences rather than a single event. Childhood abuse and neglect, domestic violence, trafficking, refugee experiences, and repeated medical trauma all produce complex trauma patterns. The hallmark is disruption across three domains: emotion regulation, self-concept, and relational patterns. Complex trauma is particularly prevalent in addiction populations and requires specialised treatment approaches. The PTSD Symptom Checker can help assess whether your symptoms meet criteria for PTSD or complex PTSD.
Trauma-informed addiction treatment
Trauma-informed care is not just about trauma therapy. It's an orientation that all addiction treatment should adopt: recognising that most clients have significant trauma histories, creating physical and relational safety, avoiding approaches that inadvertently re-traumatise, building genuine trust before expecting disclosure, and understanding behaviour through a trauma lens rather than a moral lens. When evaluating treatment programmes, ask specifically whether they take a trauma-informed approach and what specific training their staff have received.
Specific trauma-focused interventions with strong evidence for addiction populations include EMDR (Eye Movement Desensitisation and Reprocessing), Seeking Safety (designed specifically for co-occurring trauma and addiction), trauma-focused CBT, and somatic approaches. Share this screener with your treatment provider to support a comprehensive trauma-informed treatment plan.