There is a well-established and often underestimated connection between trauma and substance use disorders. For many individuals struggling with addiction, the roots of their substance use trace back not to a simple choice, but to a nervous system shaped by painful, unresolved experiences. Understanding this connection is no longer optional for those working in behavioural health. It is foundational.

On 16 April 2026, Dr Denis Antoine II, a board-certified psychiatrist and addiction medicine specialist at Johns Hopkins Bayview Medical Center, will lead a live training session exploring precisely this topic. The session, How Trauma Impacts SUD and Subsequent Treatment Efforts, is open to clinicians, counsellors, peer recovery specialists, social workers, and programme administrators, and offers up to 1.25 contact hours.

The Neurobiological Link Between Trauma and Substance Use Disorders

Trauma does not simply leave emotional scars. It physically alters the brain. When a person experiences chronic or acute trauma, particularly during childhood, the stress response systems become dysregulated. The hypothalamic-pituitary-adrenal (HPA) axis, which governs cortisol release, can become either hyperactive or blunted. The prefrontal cortex, responsible for decision-making and impulse control, loses some of its capacity to regulate the amygdala, the brain’s alarm centre.

This neurobiological disruption creates fertile ground for substance use. Research consistently shows that individuals with a history of adverse childhood experiences (ACEs) are significantly more likely to develop substance use disorders in adulthood. A landmark study published in the American Journal of Preventive Medicine found that individuals with four or more ACEs were five to twelve times more likely to use illicit substances compared to those with no adverse childhood experiences.

Substances, in this context, are not random choices. They become functional tools for managing an overwhelmed nervous system. Alcohol may dampen hypervigilance. Opioids may numb emotional pain. Stimulants may help individuals feel present and alive when dissociation takes hold. The substance use, however problematic, is often an attempt at self-regulation in the absence of healthier coping resources.

How Trauma Complicates Treatment Engagement

One of the most clinically significant consequences of trauma is its effect on how individuals engage with treatment. Trust, which is the very foundation of a therapeutic relationship, is often one of the first casualties of trauma. For someone whose traumatic experiences involved a caregiver, authority figure, or institution, entering a treatment programme can feel not like a refuge but a re-exposure to dynamics they have learned to fear.

This is why trauma and substance use disorders must be considered together, not sequentially. A clinician who addresses only the substance use without understanding its traumatic underpinnings may find a patient disengaging, missing appointments, or leaving treatment prematurely. These are not signs of poor motivation. They are often signs of an unaddressed trauma response.

Research supports this: individuals with co-occurring post-traumatic stress disorder (PTSD) and substance use disorders show significantly lower treatment retention rates compared to those without PTSD. They are also more likely to experience relapse, particularly when trauma symptoms are triggered during the recovery process.

Common Clinical Presentations to Recognise

Trauma does not always present in obvious ways within an addiction treatment setting. Clinicians who are familiar with the spectrum of trauma-related presentations are far better positioned to respond with empathy and precision.

Some of the most common presentations include persistent emotional dysregulation, difficulty tolerating distress, shame-based thinking, avoidance of therapeutic topics, dissociation during sessions, and a pattern of escalating substance use in response to environmental stressors. Individuals may appear guarded, hostile, or erratic, not because they are unwilling to engage, but because their nervous system has learned that vulnerability is dangerous.

Physical health complaints without clear medical explanation, sleep disturbances, and a history of multiple treatment episodes without sustained recovery are also common markers worth exploring with a trauma-informed lens.

Applying Trauma-Informed Principles in Addiction Care

Recognising trauma is only the first step. The real clinical challenge lies in embedding trauma-informed principles into the day-to-day fabric of addiction treatment. This means shifting from a model that asks “what is wrong with this person?” to one that asks “what happened to this person, and how has it shaped the way they are showing up today?”

Practically, this looks like creating physical and relational environments that feel predictably safe. It means being transparent about treatment expectations, offering choice wherever possible, and actively building collaborative rather than hierarchical therapeutic relationships. It also means training all staff, not only therapists, but intake workers, reception staff, and peer support specialists, to understand how trauma responses can manifest across every point of contact.

Screening for trauma early in the treatment process, and using validated tools such as the ACE questionnaire or the Trauma Screening Questionnaire, allows clinicians to tailor treatment plans that account for underlying trauma histories.

Integrated approaches that address trauma and substance use disorders simultaneously, such as Seeking Safety or Trauma-Focused Cognitive Behavioural Therapy adapted for addiction settings, have shown promising outcomes in improving both retention and recovery.

Why This Matters Now

The intersection of trauma-informed addiction treatment and public health has never been more urgent. In the United States alone, over 46 million people aged 12 or older met the criteria for a substance use disorder in 2021, according to the National Survey on Drug Use and Health. Simultaneously, population-level trauma exposure, including the lasting effects of the COVID-19 pandemic, community violence, and systemic inequality, continues to rise.

Clinicians and programme leaders who invest in deepening their understanding of trauma and substance use disorders are not simply improving individual outcomes. They are building systems that are more responsive, more humane, and ultimately more effective.

Dr Antoine’s upcoming session offers a structured opportunity to do exactly this. Whether you are a seasoned clinician seeking to refine your practice or a programme leader looking to embed trauma-informed principles across your service, this training provides a meaningful conceptual and practical foundation. (Source: WRD News)