One of the most frustrating realities in mental health treatment is this: the people who need care the most are often the ones least likely to complete it. Dropout from therapy, particularly trauma-focused therapy, is a significant clinical problem. Understanding why it happens is essential to addressing it.
The conventional explanations focus on logistics: cost, scheduling, transportation, insurance coverage. These barriers are real. But research points to a more clinically fundamental reason why people with trauma histories disengage from treatment, one that lives inside the therapeutic process itself.
Dissociation.
Brady and colleagues (2001) examined dropout from an exposure therapy protocol for PTSD among cocaine-dependent individuals. Those who completed treatment showed significant reductions in both PTSD symptom clusters and cocaine use, a meaningful finding for a population often considered too complex to treat effectively. But the dropout rate was high. And when the researchers compared completers to dropouts, they found something telling: dropouts had significantly higher avoidance symptoms at baseline. The authors suggested that high levels of dissociation, and the failure to address this symptom early in treatment, may have been a primary driver of attrition.
This makes clinical sense. Trauma treatment, particularly exposure-based approaches, requires a person to tolerate increasing contact with traumatic material. For someone with high dissociation, that contact triggers the very mechanism that has protected them from overwhelming experience. They disconnect. They miss sessions. They stop calling back. It does not look like resistance; it looks like life getting in the way. But underneath, the nervous system is doing exactly what it was trained to do: protect the person from unbearable internal experience.
Wenzel and colleagues (1996) added another dimension to this picture. In a study of male veterans recently detoxified from alcohol and drugs, they found that high levels of dissociation persisted after detoxification and suggested that this persistence may make it difficult for substance abuse patients to benefit from cognitive or psychoeducational therapies. The very treatments most offered in substance abuse settings require cognitive engagement that dissociation actively disrupts.
Perhaps most compellingly, Somers (2003) studied 93 Israelis dually diagnosed with PTSD and substance use disorder and found that dissociation levels made an independent negative contribution to predicting abstinence. His conclusion was direct: “Without a thorough resolution of trauma-related dissociation, optimal treatment outcome is compromised.”
What does this mean in practice? It means that effective trauma treatment must assess and address dissociation directly, not treat it as a side effect of other work. It means that dropout should trigger clinical curiosity, not frustration, and that reaching back out to clients who disengage may be one of the most clinically important things a provider can do.
It also means that clients who have left therapy before, including those who have left our practice, are not always treatment failures. They may have been in a treatment that was not yet equipped to meet them where they were.
If you have tried therapy before and found yourself unable to stay, we want you to know: that experience has something to tell us about what you need next. We are here to listen.
References
Brady, K. T., Dansky, B. S., Back, S. E., Foa, E. B., & Carroll, K. M. (2001). Exposure therapy in the treatment of PTSD among cocaine-dependent individuals. Journal of Substance Abuse Treatment, 21(1), 47–54.
Somers, J. M. (2003). Dissociation and abstinence in dually diagnosed patients. Unpublished manuscript.
Wenzel, T., Bernecker, C., Brendler, C., Dantendorfer, K., Lykoudis, E., Mairhofer, M., & Steinbuch, M. (1996). Dissociation and substance abuse. American Journal of Drug and Alcohol Abuse, 22(3), 339–351.
Caldeira, N. A. (2004). Dissociation and Treatment Outcome in Urban Women with Comorbid PTSD and Substance Use Disorders. ProQuest, April 2004. UMI Dissertation Services Microform 3126239.