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What is CBT? A Plain-Language Guide to Cognitive Behavioural Therapy

CBT Cognitive Behavioural Therapy Anxiety Depression Psychotherapy

Written by Nastassja Volkov · Psychologische Psychotherapeutin

You’ve probably heard of CBT. It’s mentioned in almost every conversation about modern psychotherapy, recommended by the NHS, taught in psychology programmes worldwide, and backed by more research than almost any other therapeutic approach.

But what does it actually involve? What happens in a CBT session? And is it right for you?

The core idea

Cognitive Behavioural Therapy is built on a straightforward premise: the way we think (cognition) and the way we behave (behaviour) are not just symptoms of how we feel, they actively shape our emotional experience.

A situation happens. We interpret it. That interpretation generates a feeling. The feeling influences what we do next. And what we do next reinforces the interpretation.

This is the CBT model. It sounds simple, but the implications are significant.

If a colleague doesn’t respond to your email, you could interpret that as:

  • “They’re busy”
  • “They don’t like me”
  • “I said something wrong”

Each interpretation generates a different emotional response: indifference, anxiety, guilt. CBT works by helping you examine which interpretations you habitually reach for, where they come from, and whether they’re actually accurate.

A brief history

CBT was developed in the 1960s by the psychiatrist Aaron Beck, who noticed that his depressed patients had a consistent stream of negative automatic thoughts about themselves, the world, and the future (what he called the “cognitive triad”). He found that directly examining and challenging these thoughts reduced depressive symptoms.

Albert Ellis, working in parallel, developed Rational Emotive Behaviour Therapy (REBT), another early cognitive approach. These strands merged and evolved, and modern CBT is now a family of related approaches: classic CBT, acceptance and commitment therapy (ACT), dialectical behaviour therapy (DBT), metacognitive therapy (MCT), and more.

What CBT treats

CBT has been studied more extensively than any other psychological therapy. The evidence base is strongest for:

  • Depression: multiple meta-analyses show CBT is as effective as antidepressants for moderate depression, with better long-term outcomes
  • Anxiety disorders: panic disorder, generalised anxiety disorder, social anxiety, specific phobias
  • OCD (with ERP: Exposure and Response Prevention)
  • PTSD: trauma-focused CBT is a first-line treatment in European and US guidelines
  • Eating disorders: CBT-E (enhanced CBT) is the leading psychological treatment for bulimia and binge eating disorder
  • Chronic pain and health anxiety
  • Insomnia: CBT-I (CBT for insomnia) outperforms sleeping pills in long-term outcomes
  • Burnout and work-related stress

It is less suitable for some presentations, including complex personality structures and trauma that requires a more relational or somatic approach; a good therapist will tell you honestly whether CBT is the right fit.

What a CBT session actually looks like

CBT is structured in a way that can feel quite different from the stereotypical “lie on the couch and talk about your childhood” image of therapy.

Early sessions (typically sessions 1–3):

  • Getting to know your situation, history, and what brings you to therapy
  • Identifying the specific problems you want to work on
  • Explaining the CBT model and how it applies to your particular difficulties
  • Setting collaborative goals for therapy

Middle sessions (the bulk of therapy):

  • Identifying automatic thoughts — the quick, reflexive interpretations that arise in difficult situations
  • Examining the evidence for and against those thoughts
  • Developing more balanced, realistic alternative perspectives
  • Behavioural experiments — testing assumptions in real life
  • Exposure (for anxiety): gradually approaching feared situations in a controlled way
  • Behavioural activation (for depression): scheduling activities that can lift mood, even without initial motivation

Later sessions:

  • Consolidating skills
  • Planning for the future — identifying early warning signs of relapse and a personal toolkit to use

Sessions typically last 50 minutes. A standard CBT course is 12–20 sessions, though shorter courses (8–10 sessions) are effective for less complex presentations, and longer courses are appropriate for more complex problems.

Between sessions: homework

CBT involves work between sessions. This is not optional — it’s how the therapy works. You might be asked to:

  • Keep a thought diary, noting what happened, how you interpreted it, and how you felt
  • Test a specific prediction in real life (“I think people will notice I’m anxious — let me try talking in a meeting and see what actually happens”)
  • Do a scheduled activity and notice the effect on your mood
  • Practise a breathing or grounding technique

The sessions are where you learn the tools. The between-session work is where you use them.

Is CBT available in English in Germany?

This is where many expats and internationals run into difficulty. CBT is widely practised in Germany, but the vast majority of licensed therapists work exclusively in German.

Finding an English-speaking CBT therapist in Germany is possible but requires effort. Online therapy makes it significantly easier, since you’re not restricted to the therapists in your local area.

Things to look for:

  • Approbation — the state licence to practise psychotherapy in Germany. This confirms the therapist has completed the required training.
  • Cognitive Behavioural Therapy (Verhaltenstherapie) as the specified therapeutic approach
  • Sessions in English offered explicitly

When in doubt, ask directly: “How many years have you been conducting CBT sessions in English?” Fluent English and proficiency in delivering CBT in English are not the same thing.

How CBT differs in online vs. in-person sessions

The evidence on this is clear: online CBT — delivered via video — is as effective as in-person CBT for the vast majority of presentations. A 2018 meta-analysis of over 17,000 participants (Andrews et al.) found no significant difference in outcomes between video-based and face-to-face CBT for depression, anxiety, and PTSD.

Practical considerations:

  • You need a stable internet connection and a private space
  • Some people find it easier to open up from their own environment
  • Exposure tasks can be done in your actual environment (often more ecologically valid than a therapy office)

The only presentation where in-person is clearly preferable is severe eating disorders requiring medical monitoring, and some acute safety situations.

CBT and medication: do you need both?

For mild to moderate depression and most anxiety disorders: CBT alone is often sufficient.

For moderate to severe depression and some anxiety disorders: combining CBT with antidepressant medication shows better outcomes than either treatment alone.

If you are already on medication and want to start therapy: this is not only fine, it is often the ideal — medication reduces symptoms enough to make the cognitive and behavioural work more accessible.

If you are considering stopping medication: do not do this abruptly or without medical supervision. A psychiatrist or GP should manage medication changes, not your psychotherapist.

What CBT is not

A few common misconceptions:

“CBT is just positive thinking.” No. CBT is not about replacing negative thoughts with positive ones. It’s about replacing inaccurate thoughts with more realistic ones. Sometimes the realistic thought is still not pleasant, but it’s workable.

“CBT doesn’t deal with the past.” CBT focuses primarily on current patterns, but good CBT will explore where those patterns came from. Understanding the origins of a belief (“I learned I wasn’t safe to speak up”) can be part of changing it.

“CBT is only for people who are very intellectual.” CBT requires some self-reflection, but it’s been successfully adapted for people across the cognitive spectrum, different educational backgrounds, and different cultures.

“If CBT didn’t work for me before, it will never work.” CBT quality varies significantly between therapists. A poor therapeutic relationship, insufficient training, or a therapist who wasn’t a good fit can all reduce effectiveness. It may be worth trying again with a different therapist.

I am a licensed German psychotherapist (Psychologische Psychotherapeutin, approbiert) specialising in cognitive behavioural therapy. I offer CBT in English, German, Spanish, and Russian, online, across Germany.