Understanding CBT and ERP

As a senior CBT therapist, I often find that people are understandably confused about the difference between cognitive behavioural therapy (CBT) and exposure and response prevention (ERP). Many assume they are completely separate therapies, when in fact ERP is a specific form of CBT.

CBT is a broad and well-established therapy that looks at the links between thoughts, feelings, and behaviours. It helps people notice unhelpful patterns and teaches strategies to respond differently. CBT can be used for a wide range of difficulties, including anxiety, PTSD, depression, phobias, health anxiety, and many others.

What is ERP therapy?

Exposure and response prevention (ERP) is one of the interventions within CBT and is particularly effective for obsessive compulsive disorder (OCD) and related conditions.

In ERP, the main focus is on gradually confronting the thoughts, images, or situations that bring on anxiety (exposure), while learning not to engage in the usual rituals or compulsions that temporarily reduce that anxiety (response prevention). Over time, this retrains the brain to recognise that the feared consequences do not occur, and the anxiety reduces naturally without compulsive behaviour.

In my clinical experience, I frequently have to explain to patients that ERP is not a completely separate therapy requiring a different type of therapist. All CBT therapists are trained to deliver ERP because it is one of the recognised interventions within the CBT model. The reason ERP is so often discussed separately is because of its strong evidence base for OCD specifically. However, when you hear that a therapist is offering CBT for OCD, it almost always means they will be using ERP as part of that treatment.

Examples of ERP in practice

Contamination OCD

Imagine someone experiencing OCD with a fear of contamination. They may spend long periods of time washing their hands or avoiding touching objects in public spaces.

In CBT, we would first explore how the person’s thoughts (“If I touch this, I’ll get seriously ill”) link to their feelings (intense anxiety and disgust) and behaviours (compulsive washing or avoidance).

Using ERP, the treatment would then involve gradually facing these feared situations in a structured way, such as touching a doorknob and delaying or resisting handwashing. With support, the person learns that the feared outcome does not happen, and their anxiety naturally decreases over time without needing compulsive washing.

Checking OCD

In cases of mental checking OCD, a person may repeatedly go over their memories or mentally review events to ensure they haven’t caused harm.

ERP would involve exposure to the triggering thought (for example, “What if I accidentally harmed someone?”) while resisting the urge to check or mentally replay events for reassurance. Over time, this helps reduce the intensity of the anxiety and breaks the cycle of compulsions.

Advice for people seeking ERP therapy

It is common for people to feel unsure about whether they need to find a therapist who is specifically 'trained in ERP'.

This can sometimes make the process of looking for help feel confusing. The important thing to know is that ERP is a well-recognised intervention within CBT, and all accredited CBT therapists are trained to deliver it where appropriate. You do not need to look for a therapist who is labelled only as an 'ERP therapist'.

Tips for finding the right therapist

When looking for a therapist, it may be helpful to:

• Check accreditation: In the UK, accredited CBT therapists are registered with the BABCP (British Association for Behavioural and Cognitive Psychotherapies). Accreditation means they have the appropriate training and skills to deliver CBT, including ERP.
• Ask about experience with OCD: While all CBT therapists are trained in ERP, it can be reassuring to ask if the therapist has experience working with OCD or anxiety disorders.
• Clarify what CBT will involve: If you are offered CBT for OCD, you can ask your therapist how ERP will be used within the treatment. They should be able to explain this clearly and involve you in planning the exposure exercises.
• Expect gradual steps: ERP is not about being forced into overwhelming situations. A good therapist will work with you at a pace that feels safe and manageable, building confidence gradually.
• Focus on collaboration: ERP is most effective when you and your therapist work together as a team. You should feel supported and guided through the process.

In summary, if you are offered CBT for OCD, this usually means ERP will be included as a core part of the treatment. By working with an accredited CBT therapist, you can be confident that you are receiving evidence-based care that is designed to help you overcome the cycle of obsessions and compulsions in a safe and supportive way.