Recognise obsessions, overt and mental compulsions and avoidance, assess intrusive harm content without equating thoughts with intent, and sequence exposure and response prevention, SSRIs and specialist care by functional impairment and response.
OCD is defined by obsessions, compulsions or both that consume time, cause distress or impair functioning. Obsessions may concern contamination, responsibility for harm, taboo content, symmetry, morality or relationships. Compulsions include washing, checking, ordering, repeating, confessing and seeking reassurance, but can be entirely mental, such as reviewing, counting, replacing a thought or trying to obtain certainty. The person usually recognises the experience as their own, even when insight into excessiveness varies. Ask directly and neutrally because shame and fear of being judged dangerous can conceal the syndrome.
Construct a cycle for one recent episode: trigger, intrusive meaning, emotion, ritual or avoidance, immediate relief and longer-term cost. Compulsions are linked to rigid feared consequences or rules and are not pleasurable habits. Distinguish generalised worry, depressive rumination, trauma intrusions, psychotic beliefs, autistic routines, health anxiety, eating-disorder rituals and body dysmorphic preoccupation. Tic disorders may coexist. Assess depression and suicide risk, physical injury, time loss, family accommodation and effects on dependants.
Familial and neurodevelopmental vulnerability contributes, with stronger aggregation observed in some early-onset and tic-related clinical presentations.
Inflated responsibility, intolerance of uncertainty and attempts to suppress ordinary intrusions can turn them into persistent perceived threats.
Symptoms may emerge or intensify during stress, pregnancy, the postnatal period or major role changes without one event being necessary.
Common unwanted mental events are interpreted as morally significant, dangerous or predictive, producing anxiety and a need for certainty.
Rituals and reassurance reduce distress briefly, reinforcing repetition and preventing the person from learning that uncertainty and anxiety subside without neutralising.
Altered cortico-striatal control and habit systems may contribute to repetitive responding, but do not reduce the importance of psychological meaning and learning.
A recurrent thought, image or urge intrudes against the person's wishes and evokes anxiety, disgust, doubt or responsibility.
Washing, checking, arranging or repeating follows a rule or feared consequence and produces only temporary relief.
Counting, reviewing, praying, thought replacement or internal reassurance can neutralise distress while remaining invisible to observers.
The person avoids triggers while relatives answer repeated questions, perform rituals or reorganise daily life to prevent distress.
Certainty about feared consequences can become strong, but longitudinal phenomenology and response to doubt help distinguish obsession from psychosis.
A fixed externally imposed belief with impaired reality testing differs from an intrusive self-generated thought, although insight in OCD can be poor.
Rumination revisits loss and worry addresses plausible future problems, whereas obsessions often trigger ritualised neutralising and rigid responsibility.
Repetitive routines, premonitory urges and weight-directed rituals have different functions but can coexist with independently assessable OCD.
Washing, chemical use, checking and restricted eating can cause dermatitis, burns, musculoskeletal injury, infection, malnutrition and sleep deprivation.
Shame, exhaustion and functional loss commonly coexist with depression and can increase suicide risk despite obsessional thoughts themselves being unwanted.
Accommodation can consume household routines, disrupt parenting and work, intensify conflict and make the family increasingly dependent on rituals.
The distress and avoidance surrounding an intrusive harm thought may indicate the person's values, while risk still depends on desire, plan and behaviour.
Repeatedly confirming that catastrophe is impossible gives brief relief but strengthens doubt and recruits clinicians or relatives into the compulsion.
Exposure fails when visible checking stops but mental review, prayer or thought replacement continues to neutralise uncertainty.
Treatment selection in the NICE pathway is based on impairment and previous response, not merely the unusualness of obsessional content.
Assuming violent or sexual obsessional content means intent without assessing ego-dystonic distress and actual behaviour.
Providing repeated certainty during every review and inadvertently becoming part of a reassurance compulsion.
Calling exposure complete while covert neutralising, checking or family accommodation continues unchanged.
Stopping an SSRI at six weeks because depression improves faster than the OCD symptoms.
Starting complex antipsychotic augmentation in primary care before adequate ERP, SSRI trials and specialist review.
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An adult spends most of the day washing and checking, cannot work and has severe functional impairment from OCD. Which initial treatment offer matches NICE guidance?
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.
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Treatment intensity follows functional impairment. Adults with mild impairment should be offered low-intensity CBT including ERP, up to ten therapist hours, through structured individual, telephone or group formats. Mild impairment that cannot engage or has not improved, and moderate impairment, leads to a choice between an SSRI and more intensive CBT including ERP. Severe impairment warrants combined SSRI and CBT with ERP. For obsessional thoughts without visible compulsions, exposure includes the thoughts while response prevention targets mental rituals and neutralising.
Explain that an SSRI does not produce craving or tolerance but can cause adverse effects and withdrawal, and that OCD response may take up to twelve weeks. NICE initial adult choices include fluoxetine, fluvoxamine, paroxetine, sertraline or off-label citalopram. If a standard dose is tolerated but inadequate after four to six weeks, consider gradual increase according to the current SmPC. After inadequate SSRI or intensive CBT alone, conduct multidisciplinary review and offer combined treatment; further non-response may lead to another SSRI or clomipramine and specialist expertise rather than primary-care antipsychotic augmentation.
Actively monitor early anxiety, agitation, akathisia, suicidal thinking and mania, plus bleeding, hyponatraemia, sexual dysfunction and serotonergic interactions; benefit can take longer in OCD and stopping should be gradual.