What Is CBT (Cognitive Behavioural Therapy)?

What Is CBT?

CBT — Cognitive Behavioural Therapy — is a structured, evidence-based psychotherapy that targets the relationship between thoughts, feelings, and behaviours. It is based on the principle that unhelpful patterns of thinking and behaving maintain psychological distress, and that by identifying and changing these patterns, people can significantly improve how they feel.

CBT was developed in the 1960s by the American psychiatrist Aaron Beck, who was researching depression and noticed that his patients had a consistent stream of automatic negative thoughts that maintained their low mood. His cognitive model proposed that it was not events themselves that caused distress, but the interpretation — or meaning — placed on those events. This insight became the foundation of CBT.

Over the following decades, CBT expanded into one of the most extensively researched forms of psychotherapy in existence. Today, NICE — the National Institute for Health and Care Excellence — recommends CBT as a first-line or primary treatment for depression, generalised anxiety disorder, social anxiety disorder, panic disorder, OCD, PTSD, and phobias, among others. No other psychological therapy has as large or consistent an evidence base.

A key characteristic of CBT is its collaborative, structured nature. Sessions typically begin with an agenda — a brief agreement between you and your therapist about what to focus on. The work is active and skills-based: you learn to identify unhelpful thoughts, examine the evidence for and against them, and test out different behaviours. Homework between sessions is a central component — CBT is not simply something that happens in the therapy room but a set of skills you apply in daily life.

A typical course of CBT is 6–20 sessions, depending on the condition being treated and the individual's presentation. NICE guidelines specify recommended session numbers for particular conditions — for example, 16–20 sessions for moderate-severe depression and 12–15 for OCD.

How Does CBT Work?

CBT works by targeting the cognitive triangle — the interconnection between thoughts, feelings, and behaviours. In the CBT model, these three elements influence each other in a continuous cycle: what we think affects how we feel and what we do; what we do affects what we think and how we feel; how we feel affects what we think and what we do.

When this cycle contains unhelpful patterns — such as catastrophic thinking, black-and-white reasoning, avoidance, or safety behaviours — it can maintain and intensify distress even when the original trigger is no longer present. CBT aims to identify and interrupt these maintaining cycles.

The cognitive component involves identifying and examining automatic thoughts — the rapid, often barely conscious thoughts that arise in response to situations. For example, a person with social anxiety might automatically think "everyone will notice I'm anxious and judge me" when entering a social situation. CBT teaches you to recognise these thoughts, examine the evidence for them, and develop more balanced, realistic alternatives — not by forcing positive thinking, but by genuinely evaluating the evidence.

Cognitive restructuring is the process of systematically challenging and revising unhelpful thinking patterns. This is done collaboratively with the therapist using techniques such as Socratic questioning, thought records, and behavioural experiments that test the accuracy of predictions.

The behavioural component addresses avoidance and unhelpful behaviours that maintain distress. Avoidance provides short-term relief but reinforces the belief that the avoided situation is dangerous and prevents the brain from learning that it is manageable. Behavioural experiments and graded exposure are used to break avoidance cycles, allowing new learning to occur.

Between sessions, you apply these skills in real situations — keeping thought records, testing out different behaviours, and monitoring the results. This between-session practice is what consolidates learning and produces lasting change.

What Can CBT Help With?

CBT has the most extensive evidence base of any psychological therapy and is recommended by NICE for a broad range of conditions.

• Depression — NICE CG90 recommends CBT for mild-to-severe depression; typically 16–20 sessions for moderate-severe presentations
• Generalised anxiety disorder (GAD) — NICE CG113 recommends CBT as the primary psychological treatment; characterised by persistent, uncontrollable worry
• Social anxiety disorder — NICE recommends CBT as the first-line treatment; cognitive and behavioural approaches address social threat appraisal and avoidance
• Panic disorder — NICE recommends CBT; focuses on challenging catastrophic interpretations of physical sensations and reducing safety behaviours
• OCD (obsessive-compulsive disorder) — NICE recommends CBT with ERP (Exposure and Response Prevention) as the first-line psychological treatment
• PTSD and trauma — NICE NG116 recommends trauma-focused CBT alongside EMDR as first-line treatments
• Phobias — specific phobias respond well to CBT-based graded exposure
• Insomnia — CBT for insomnia (CBT-I) is the NICE-recommended first-line treatment, now recommended over sleep medication
• Chronic pain management — CBT is effective in improving function and quality of life in chronic pain conditions
• Eating disorders — CBT-E (enhanced CBT) is a primary NICE-recommended treatment for bulimia nervosa and binge eating disorder

What to Expect in a CBT Session

CBT sessions are typically structured and agenda-driven, which distinguishes them from less directive forms of therapy. At the start of each session, you and your therapist will briefly agree on what to focus on — typically drawing on experiences from the previous week, between-session homework, or a specific problem you want to address.

A typical session follows this rough structure: a check-in about mood and any significant events since the last session; review of the homework set in the previous session; the main session work (which might involve examining a specific thought pattern, doing a behavioural experiment, or learning a new skill); and setting homework for the next session.

Homework is a central component of CBT, not an optional extra. Between-session tasks might include keeping a thought diary, testing out a new behaviour in a real situation, monitoring your mood, or practising a relaxation or mindfulness technique. The evidence suggests that active engagement with between-session tasks is one of the strongest predictors of CBT outcomes.

Your therapist will work collaboratively with you throughout — explaining the rationale for each technique, checking what is and is not working, and adjusting the approach based on your feedback. CBT is not something that is "done to you" but a set of skills you develop, with the therapist as your guide.

The number of sessions is agreed at the outset based on your presentation and the NICE-recommended course length for your condition. Sessions are typically 50 minutes and held weekly. Progress is usually reviewed mid-way through the agreed course.

Is CBT Right for Me?

CBT tends to suit people who prefer a structured, skills-based approach and are comfortable with an active role in their own therapy — including completing homework between sessions. It is particularly well suited if you can identify specific problems or thought patterns you want to address, and if you are willing to test out new approaches to thinking and behaving in your daily life.

CBT may be less well suited if you are primarily seeking open-ended exploration of your history and relationships without a structured framework, or if you prefer a therapy that focuses primarily on the therapeutic relationship and emotional experience rather than skills and techniques. In these cases, a person-centred or psychodynamic approach may be a better fit.

CBT also requires a degree of stability — it is most effective when you can engage with the cognitive and behavioural work between sessions. If you are in acute crisis or dealing with very severe symptoms, stabilisation work may need to come first.

The best way to assess whether CBT is right for you is to have an initial assessment conversation with a qualified therapist, who can discuss your presentation, preferences, and goals and recommend the most appropriate approach. It is entirely normal to have a preference for a particular modality, and a good therapist will factor this into their recommendation.

CBT vs Person-Centred Therapy

CBT and person-centred therapy are both evidence-based approaches, but they differ significantly in structure, focus, and the role of the therapist.

CBT is structured, directive, and skills-focused. The therapist takes an active role in setting agendas, teaching techniques, and directing the work. The focus is on specific problems — particular thought patterns or behaviours that maintain distress. Progress is often measurable and the course has a defined end point. Homework is expected.

Person-centred therapy (also called Rogerian therapy or client-centred therapy) is non-directive. The therapist provides unconditional positive regard, empathy, and genuineness, but does not set agendas or direct the content of sessions. The client leads. The focus is on the therapeutic relationship as the agent of change, and on the individual's own resources for growth. Sessions may explore a wide range of experiences without a defined problem list.

Neither approach is universally superior. CBT has a larger evidence base for specific diagnosable conditions (particularly anxiety and depression) and is more commonly recommended by NICE for these presentations. Person-centred therapy has evidence for depression and anxiety and is particularly valued where the primary need is for a safe, accepting relationship in which to explore personal experiences without structure or direction.

Many people find value in both at different times, and some therapists integrate elements of both approaches. Your therapist can help you identify which might be the better starting point for your particular situation.

Getting Started with CBT

CBT is available at RB Counselling in Belfast for adults experiencing depression, anxiety, OCD, trauma, or other conditions for which NICE recommends CBT. No GP referral is needed — you can self-refer directly.

Your first session is an assessment in which you share your situation and we discuss your goals and which therapeutic approach is most appropriate for you. If CBT is the right fit, we will explain how it works, agree a course length, and begin the structured work from the next session onwards.

For more about anxiety — one of the conditions CBT is most effective for — see our article on Signs of Anxiety.