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Purpose and principlesIndications, selection and cautionsAssessment before treatmentTreatment approachComplications, monitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
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Cognitive behavioural therapy principles

Psychiatry · UK scope · Sources checked 7 Sept 2026 · Clinical review pending

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Escalating risk during therapy

New suicidal intent, profound self-neglect or emerging mania changes the immediate treatment priorities.

Action: Assess immediate safety and arrange urgent mental-health assessment when indicated; coordinate the therapy plan with the clinician managing the acute illness.

Purpose and principles

Understand how collaborative formulation and behavioural experiments guide cognitive behavioural therapy, and select the appropriate disorder-specific intervention and treatment intensity.

Cognitive behavioural therapy is a structured psychological treatment in which the therapist and patient investigate relationships between interpretations, emotions, bodily experiences and actions. Its starting point is an individual formulation: an account of how a problem developed and what keeps it going now. The formulation is provisional and is revised when experience does not fit it. A person who avoids colleagues because they expect humiliation may obtain immediate relief, but lose opportunities to discover that ordinary conversations are tolerable. Repeated avoidance can therefore maintain anxiety even when the original trigger has passed.

Cognitive work does not mean telling someone to think positively or insisting that every fear is irrational. Some threats are real, including discrimination, unsafe housing or abusive relationships. Therapy distinguishes realistic action from predictions that can be tested, and it examines the costs and benefits of coping responses. Questions might explore the evidence for an interpretation, alternative explanations, what the person would tell a friend, and what happened when a prediction was tested. Behavioural methods can produce useful learning even when someone struggles to identify a precise automatic thought.

A typical session agrees an agenda, checks mood and safety, reviews practice from the previous meeting, works on a specific difficulty, and agrees an achievable task between sessions. Written records are one option, not a requirement for literacy or fluent speech. Audio notes, pictures, interpreters and practical demonstrations may improve access. Tasks should follow from the formulation and be designed with the person; non-completion is information about fatigue, fear, understanding, material barriers or an unsuitable task. The therapist should explore it without judgement.

NICE NG222 places CBT among the treatment choices for depression. For less severe depression, discuss the options and consider guided self-help first because it is least intrusive and resource intensive; do not automatically assign everyone to a digital programme. Individual CBT usually involves eight sessions for less severe depression and sixteen for more severe depression. Additional sessions can address comorbidity, complex social needs or residual symptoms. Combination treatment with an antidepressant is one option for more severe depression, selected through shared decision making rather than assumed to be compulsory.

Protocol and therapeutic competence matter. Social anxiety CBT includes work on self-focused attention, safety behaviours, distorted self-imagery and behavioural experiments; NICE recommends individual treatment specifically developed for that disorder. OCD treatment uses exposure and response prevention, helping the person encounter feared cues while resisting compulsive neutralising. Generic reassurance can strengthen an OCD cycle. Therapy should follow a relevant evidence-based manual, be delivered by a practitioner trained in the intervention, and include supervision and outcome review. A supportive conversation may be valuable but is not equivalent to a complete CBT intervention.

Key points

  • CBT links a particular situation with its interpretation, associated emotion, bodily response and behavioural consequences.
  • Develop a shared, testable formulation of what maintains the person's difficulty rather than imposing a generic account of negative thinking.
  • Behavioural experiments compare a prediction with observed results; they require a clear learning question and an agreed feasible task.
  • For less severe depression, NICE describes individual CBT as usually eight sessions and guided self-help as usually six to eight supported sessions.
  • Individual CBT for more severe depression usually involves sixteen sessions, with additional sessions when clinically needed.
  • Use a disorder-specific protocol: social anxiety treatment differs from exposure and response prevention for obsessive-compulsive disorder.
  • Review safety, functioning, the therapeutic relationship and meaningful outcomes alongside symptom measures throughout treatment.

Indications, selection and cautions

Maintaining cycle

A reproducible pattern connects a trigger, feared interpretation and coping behaviour whose short-term benefit creates longer-term difficulty or functional restriction.

Safety behaviour

A subtle precaution, such as rehearsing every sentence or repeatedly checking a message, may prevent the person from learning whether their feared outcome would occur unaided.

Rumination and worry

Prolonged internal analysis can feel like problem solving while producing little action; examine when it begins, what it promises and what it costs.

Readiness and access

Interest in understanding the problem is helpful, but communication difficulties, poverty, disability or a previous disappointing therapy experience require adaptation rather than automatic exclusion.

Protocol mismatch

Repeated general discussion with no agreed formulation, behavioural work or outcome review should prompt clarification of what treatment is actually being delivered.

Red flags requiring action

  • An expressed intention to act on suicidal thoughts requires a timely safety assessment and an agreed urgent response, even when questionnaire scores have improved.
  • Reduced need for sleep with increased activity or disinhibition should prompt assessment for mania before attributing the change to successful activation.

Assessment before treatment

  1. 01
    Diagnostic and functional assessmentFirst step
    Why
    Identify the target disorder, severity, impairment and competing treatment needs.
    Interpretation and limitations
    Explore duration, previous episodes, physical illness, substance use and possible bipolarity; the relevant protocol depends on the formulation and diagnosis rather than a single score.
  2. 02
    Situation-based formulation
    Why
    Map one recent example in concrete chronological detail.
    Interpretation and limitations
    Ask what happened, what it meant, what was felt and what followed; identify the maintaining process without assuming that all distress reflects a mistaken belief.
  3. 03
    Baseline outcome measures
    Why
    Create a reference for symptoms and personally valued functioning.
    Interpretation and limitations
    Use an appropriate validated scale alongside goals such as travelling, sleeping or attending work; measurement supports discussion and cannot independently determine safety or recovery.
  4. 04
    Previous therapy and accessibility review
    Why
    Determine prior exposure, useful learning and practical obstacles to engagement.
    Interpretation and limitations
    Clarify actual treatment content and attendance, language, sensory needs, concentration, digital access and time; an unsuccessful referral does not establish treatment resistance.

Treatment approach

01Select treatmentMatch the intervention to the problemFirst stepAssessment identifies a difficulty for which a specific CBT intervention is recommended.+
  1. 1Explain the relevant options, expected work between sessions, likely duration and alternatives, then agree a target that matters to the person.
  2. 2For depression distinguish less severe and more severe presentations, considering guided self-help first for less severe illness while respecting informed preference and clinical need.
  3. 3Refer to a practitioner competent in the required protocol, describing risks, comorbidity, access adjustments and previous interventions so that assessment is not unnecessarily repeated.
02Deliver therapyTurn the formulation into learningThe person and therapist have agreed a shared explanation of a maintaining cycle.+
  1. 1Choose a specific prediction and design an experiment that can test it without exposing the person to a genuine avoidable hazard.

Complications, monitoring and follow-up

  • Review symptom change together with concrete functional goals; a lower depression score may coexist with continued isolation or inability to manage essential daily tasks.
  • Ask about suicidal thoughts and deterioration when clinically indicated and at meaningful changes, using direct discussion rather than relying on a questionnaire item alone.
  • Check whether practice between sessions generated useful learning and whether the person experienced the task as collaborative, relevant and achievable.
  • Before ending, identify helpful skills, early warning signs, likely future stressors and an accessible route back to care if symptoms recur.
  • For people continuing psychological treatment to prevent depressive relapse, NICE recommends adapting the same therapy with at least four additional sessions focused on staying well.

Special situations

Experiments need predictions

Attending a social event becomes a behavioural experiment when the person specifies what they expect, observes the outcome and evaluates the prediction afterwards.

Exposure is diagnosis specific

The task, feared consequence and response being reduced differ across panic, social anxiety and OCD; interchangeable exposure instructions can miss the maintaining mechanism.

Real adversity needs action

Debt advice, workplace adjustments and safeguarding may be necessary alongside psychological work when the feared consequence is credible and ongoing.

Therapy intensity is flexible

Typical session numbers describe an evidence-based treatment offer; comorbidity, residual symptoms and accessibility needs may justify additional sessions rather than arbitrary discharge.

Common pitfalls

  1. 01

    Describing CBT as correcting irrational thoughts and overlooking behaviour, context, bodily sensations and collaborative discovery.

  2. 02

    Calling repeated reassurance an exposure intervention when it actually performs the neutralising response that maintains OCD.

  3. 03

    Treating missed practice as lack of motivation before checking task clarity, disability, fear and practical resources.

  4. 04

    Using the same brief generic programme for every diagnosis despite different recommended therapeutic components and intensity.

Practice

Two practice questions

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Question 1 of 2
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PsychiatryOriginal SBA

Choosing treatment intensity

A 38-year-old with a new episode of less severe depression can use structured materials between appointments and has no strong preference for a therapy format. After discussing suitable choices, which option does NICE recommend considering first because it is least intrusive and resource intensive?

Choose one answer, then submit
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Sources and review status3 sources · checked 7 Sept 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 7 Sept 2026; clinical approval remains outstanding.

  • NICE NG222 Depression in adults recommendationsTreatment selection, CBT delivery, session numbers and relapse prevention.
  • NICE CG159 Social anxiety disorder recommendationsIndividual disorder-specific CBT, behavioural experiments and safety behaviours.
  • NICE CG31 Obsessive-compulsive disorder recommendationsExposure and response prevention, treatment intensity and family accommodation.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom
  • 2Record the predicted outcome, what actually happened and what was learnt; distinguish abandoning a safety behaviour from abandoning sensible protection.
  • 3Use the result to update the formulation and plan graded practice, adapting the task if distress, fatigue or environmental barriers made the initial attempt unhelpful.
    • 03Review progressRespond to stalled or deteriorating treatmentSymptoms worsen, engagement falls or meaningful improvement is absent despite an adequate treatment opportunity.+
    1. 1Reassess immediate risk, diagnostic uncertainty, physical contributors, substance use and new adversity instead of simply increasing homework demands.
    2. 2Explore the alliance, formulation, protocol fidelity, treatment intensity and whether the agreed goals still represent the person's priorities.
    3. 3Agree adaptations, a different intervention or specialist review, and record how responsibility for ongoing care and safety is transferred.