When exposure therapy isn’t enough: how trauma can complicate OCD

Exposure and response prevention (ERP) is widely regarded as the most effective psychological treatment for OCDv. It involves helping individuals gradually face their fears, without engaging in compulsions, so that over time the brain learns the feared consequences do not occur. In this article, consultant psychologist Dr Heather Sequeira explains how this approach is life-changing.

Not everyone can engage with ERP straight away. Some find it too overwhelming. Others try but feel destabilised. And a significant number of people, especially those with a history of trauma or complex emotional difficulties, report that ERP alone does not address the full picture.

If you have tried ERP and found it unhelpful, confusing, or distressing, you are not alone. OCD is not always a straightforward condition, and exposure therapy, while powerful, is not always enough.

Why ERP doesn’t work for everyone

ERP relies on the brain’s ability to relearn safety through experience. But if the nervous system is already dysregulated, as is often the case in people with past trauma, then asking the system to tolerate further distress can feel unmanageable. Rather than desensitising the fear, the process may intensify it.

For some people, compulsions do not just function to prevent a feared outcome. They also serve as emotional regulation strategies, helping to soothe or contain anxiety that feels overwhelming. In these cases, removing the compulsion without first strengthening the person’s capacity to tolerate distress can backfire. It may lead to a shutdown, panic, or a sense of retraumatisation.

This does not mean ERP is inappropriate. It means it needs to be part of a broader, more carefully formulated treatment plan.

When OCD and trauma overlap

OCD and trauma are not the same, but they can overlap in subtle and powerful ways. Both involve:

• Intrusive thoughts or memories that feel threatening or distressing
• Avoidance of internal or external experiences that trigger discomfort
• A heightened fear response, even in situations that appear safe

When a person has lived through experiences that left them feeling helpless, blamed, or under constant threat, they may be more vulnerable to OCD. Their compulsions may not feel irrational. They may feel it necessary to prevent harm, to create order, or to regain control.

In this context, exposure therapy needs to do more than remove behaviour. It needs to be grounded in a clinical understanding of what the person is trying to manage and why those patterns developed in the first place.

What a trauma-informed approach looks like

In my clinical work, I often adapt ERP within a broader, integrative CBT framework. This is certainly not about avoiding exposure or diluting evidence-based practice. In fact, there is more need for this. The challenge is to ensure that exposure is applied in a way the nervous system can work with, and that the learning process is relevant and sustainable.

This might include:

• Drawing on knowledge of brain-body interactions to help stabilise the nervous system before or during exposure
• Identifying when compulsions are serving a deeper emotional function, such as regulation or protection
• Using clinical insight to process fears more accurately and meaningfully, not just rehearsing distress
• Working with the beliefs and internal narratives that drive obsessive doubt, often shaped by past experience
• Integrating compassion-focused strategies to reduce shame and support self-efficacy

This approach does not soften the treatment. It refines it. Instead of applying a rigid protocol, we work with what is actually happening in the person’s system. This allows exposure to be more effective, more tolerable, and ultimately more transformative.

When to seek specialist help

If you have tried ERP and felt it made things worse, or if you sense that your OCD is tied to something deeper, it may be time to work with someone who specialises in both OCD and trauma. Treatment is still possible. It may simply need to be approached differently.

A trauma-informed, neuroscience-aware CBT approach can help you move forward at a pace that feels both challenging and safe. With the right formulation, OCD becomes something you can work with rather than something you must fight against.

You do not have to choose between being functional and feeling well. With the right support, both are possible.