Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Acute stress reactions and adjustment disorder
Psychiatry · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Stress response with current danger
Suicidal intent, ongoing violence or abuse, severe dissociation, dangerous agitation, inability to care for self or dependants, acute intoxication or withdrawal, or physical injury requires immediate safety and medical care rather than watchful waiting.
Action: Establish whether threat is continuing, use ABCDE for injury or physiological disturbance, assess suicide and safeguarding, and mobilise emergency, crisis, social and practical support. Do not demand a detailed emotional account before urgent needs and consent are addressed.
Overview
Distinguish common early responses to trauma, clinically important acute stress syndromes and maladaptive responses to wider stressors, while prioritising safety, practical support, active monitoring and proportionate psychological care.
After trauma, many people experience intrusive images, disturbed sleep, startle, emotional numbing, anger, guilt, detachment or avoidance. These reactions may be painful yet improve naturally over days or weeks. Determine the nature and timing of exposure, present safety, trajectory and functional effect without suggesting that either rapid recovery or chronic illness is inevitable. DSM-5 acute stress disorder, as defined in the NICE terminology, requires nine or more symptoms drawn from intrusion, negative mood, dissociation, avoidance and arousal that persist for at least three days and no longer than one month. Do not confuse this disorder with ICD-11 acute stress reaction, which is classified as a normal-range transient response and usually begins to subside within a few days. A full PTSD diagnosis follows its separate timing and syndrome requirements.
Practice
Two practice questions
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Question 1 of 2
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PsychiatryOriginal SBA
Subthreshold early symptoms
An adult has mild improving intrusive memories and poor sleep two weeks after a traumatic event, with no major impairment or current danger. What is the recommended approach?
Sources and review status4 sources · checked 27 Aug 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 27 Aug 2026; clinical approval remains outstanding.
NICE NG116 PTSD recommendationsFirst-month terminology, active monitoring, early trauma-focused CBT, debriefing and prevention.
Adjustment disorder is linked to an identifiable psychosocial stressor that may not meet the trauma threshold, such as relationship breakdown, illness, migration, job loss or financial crisis. In ICD-11 it is characterised by preoccupation with the stressor or its consequences and failure to adapt that causes significant functional impairment; it usually emerges within one month and typically resolves within six months after the stressor and its consequences end, unless they persist. Diagnosis requires proportional, culturally informed judgement and exclusion of a better explanation such as depression, GAD, PTSD, prolonged grief, mania, substance effects or ongoing abuse. The stressor's practical consequences are part of assessment, not background detail.
Immediate care is humane and practical: address safety, shelter, food, healthcare, information, social connection and support chosen by the person. Invite but do not compel discussion, preserve routine where possible and advise against using alcohol or sedatives to suppress symptoms. For subthreshold PTSD symptoms within one month, NICE recommends active monitoring and contact within one month. Adults with acute stress disorder or clinically important PTSD symptoms should be offered individual trauma-focused CBT within that first month. Psychologically focused debriefing is not recommended.
For adjustment difficulties, create a collaborative formulation of stressor, losses, solvable problems, meanings, coping, supports and barriers. Brief structured psychological work may include problem solving, behavioural activation, sleep support, emotional processing and communication, selected for the presentation rather than applied as a single universal protocol. There is no medicine that treats adjustment disorder itself. Treat a clearly diagnosed comorbid condition according to its guidance, and do not turn short-lived sedative relief into long-term benzodiazepine exposure. Escalate when symptoms persist, worsen, meet another disorder's criteria or safety deteriorates.
Key points
Distress, poor sleep, intrusive memories, irritability, startle, numbness and concentration difficulty are common soon after trauma and do not inevitably progress to PTSD.
DSM-5 acute stress disorder, the term used in NICE NG116, requires nine or more symptoms across intrusion, negative mood, dissociation, avoidance and arousal lasting from three days to one month after trauma; ICD-11 acute stress reaction is instead a transient normal-range response that usually begins to subside within days.
Adjustment disorder describes clinically important distress and impaired adaptation arising in relation to an identifiable psychosocial stressor when another mental disorder does not better explain the presentation.
Assess current danger, suicide, injury, substances, housing, dependants, culture, loss and practical needs before deciding that symptoms need a disorder-specific intervention.
Use active monitoring with follow-up within one month for subthreshold post-traumatic symptoms, but offer individual trauma-focused CBT within the first month to adults with acute stress disorder or clinically important PTSD symptoms.
Provide flexible practical help and listen without pressure; do not offer psychologically focused debriefing or compel everyone to recount the event in detail.
Aetiology
01
Trauma exposure
Extreme threat can produce short-lived intrusion, arousal, avoidance and dissociation, with severity shaped by injury, meaning and aftermath.
02
Psychosocial stress
Loss, illness, relationship change, migration, work or financial adversity can exceed coping resources and precipitate impaired adaptation.
03
Recovery environment
Safety, social connection, practical resources and prior experience influence whether early reactions settle, persist or evolve into another disorder.
Pathophysiology
1
Acute defensive activation
Threat systems increase attention, arousal and memory salience immediately after danger, producing startle, sleep disruption and intrusive recollection.
2
Dissociative processing
Overwhelming arousal can disrupt integration of attention, bodily experience and memory, leading to detachment, unreality or patchy recall.
3
Coping-resource mismatch
When demands exceed practical, relational and psychological resources, preoccupation and avoidance can impair adaptation and prolong stress responses.
Clinical features and red flags
Expected early reaction
Intrusion, arousal, numbness and sleep difficulty arise soon after trauma but show gradual recovery with preserved or returning function.
DSM-5 acute stress disorder
Nine or more intrusion, negative-mood, dissociative, avoidance or arousal symptoms persist for three days to one month after trauma and cause clinically important distress or impairment.
ICD-11 acute stress reaction
A transient emotional, somatic, cognitive or behavioural response begins after an extremely threatening or horrific event and usually starts to subside within a few days.
Adjustment difficulty
Preoccupation with an identifiable stressor and failure to adapt disrupt daily life without another disorder better explaining the syndrome.
Dissociative response
Depersonalisation, derealisation, patchy memory or feeling detached from surroundings may follow trauma but also requires neurological and substance context.
Deteriorating trajectory
Increasing avoidance, substance use, hopelessness or functional loss over follow-up suggests active treatment or diagnostic reformulation is needed.
Red flags requiring action
Current violence, coercive control, trafficking, unsafe accommodation or contact with the perpetrator makes environmental protection an immediate clinical intervention.
Suicidal planning, severe hopelessness, reckless behaviour or inability to meet basic needs requires urgent mental-health assessment rather than routine follow-up.
Use the diagnosis that best accounts for the syndrome and impairment; adjustment disorder is not a residual label for incomplete assessment.
04Focused physical assessment
Why
Detect injury, head trauma, sleep deprivation, pain, intoxication, withdrawal and acute illness.
Interpretation and limitations
Altered consciousness, neurology or physiological instability requires medical investigation before a primary stress formulation is accepted.
05
Differential diagnosis
01
Post-traumatic stress disorder
A persistent trauma-linked syndrome with re-experiencing, avoidance, threat and negative mood changes is assessed on the PTSD pathway after the early period.
02
Depression, anxiety or grief
Pervasive anhedonia, diffuse uncontrollable worry or loss-focused yearning may better explain distress and determines disorder-specific treatment.
03
Medical or substance state
Head injury, delirium, pain, stimulant exposure and alcohol or sedative withdrawal may create anxiety, insomnia, confusion and perceptual symptoms.
Management
01Immediate supportRestore safety and practical controlFirst stepA person has recently experienced trauma, loss or a major stressor.+
1Check physical needs, current danger, suicide and safeguarding and mobilise shelter, healthcare, information and trusted support as required.
2Listen at the person's pace, validate reactions without predicting illness and help re-establish sleep, meals, routine and manageable decisions.
3Provide a named contact and follow-up plan and advise against heavy alcohol, non-prescribed sedatives and repeated distressing media exposure.
02First-month traumaMonitor or treat according to severityPost-traumatic symptoms occur within one month of the event.+
1For subthreshold symptoms, use active monitoring and arrange follow-up contact within one month, with earlier review if risk or function worsens.
Complications
01
Persistent stress disorder
Avoidance, continued threat and limited support can allow an acute presentation to evolve into PTSD, depression or chronic anxiety.
02
Self-harm and substance use
Hopelessness and attempts to suppress sleep or intrusive symptoms with alcohol or sedatives can produce immediate and longer-term danger.
03
Role and relationship loss
Reduced concentration, irritability and withdrawal can disrupt parenting, employment, housing and support precisely when recovery resources are most needed.
Monitoring and follow-up
For subthreshold trauma symptoms, arrange follow-up within one month and provide an earlier route back for worsening danger, self-harm, dissociation or function.
Track whether sleep, routine, social connection, work and self-care are recovering rather than relying only on a symptom total.
Reassess alcohol, non-prescribed drugs and sedative exposure because short-term coping can become intoxication, withdrawal or dependence.
Review the diagnosis when symptoms cross the one-month trauma threshold, become more severe or reveal depression, PTSD, grief or another disorder.
Keep practical and safeguarding actions visible until the stressor has changed or a responsible service has accepted ongoing ownership.
Special situations
Distress is not destiny
Strong early reactions can be understandable and improve naturally, while planned review protects those whose symptoms persist or worsen.
Stressor context is clinical
Debt, insecure housing, discrimination and legal uncertainty may require practical intervention before emotional coping can realistically improve.
Listening differs from debriefing
Supportive voluntary conversation is not the same as a compulsory single-session reconstruction intended to prevent PTSD.
Adjustment is not dismissal
The diagnosis can involve serious impairment and suicide risk even though the precipitating stressor does not meet the PTSD trauma threshold.
Common pitfalls
01
Predicting that everyone exposed to trauma will develop PTSD or that severe early distress will always settle unaided.
02
Forcing a detailed emotional retelling in the name of prevention despite the recommendation against focused debriefing.
03
Using adjustment disorder as a vague label without assessing depression, PTSD, substances, ongoing abuse and physical illness.
04
Prescribing a benzodiazepine to prevent PTSD or leaving a crisis prescription without a short duration and stop plan.
05
Focusing on symptoms while leaving current violence, housing, food, dependants or workplace exposure unaddressed.
Do not use drug treatment, including benzodiazepines, to prevent PTSD; prescribe only for a separately assessed indication with its own benefit, risk and stop plan.
Fluctuating attention, seizure, head injury, hypoxia, severe intoxication or withdrawal can mimic or complicate an acute stress reaction and needs medical assessment.
Severe dissociation, wandering, inability to recognise surroundings or loss of caregiving capacity requires an immediate supported safety plan and specialist input.
Active-monitoring baseline
Why
Record symptom clusters, sleep, avoidance, supports, substance use and concrete daily function.
Interpretation and limitations
Direction of change at planned follow-up helps distinguish natural recovery from persistent or evolving mental disorder.
2
For adult acute stress disorder or clinically important PTSD symptoms, offer individual trauma-focused CBT rather than waiting for a later PTSD diagnosis.
3Do not provide psychologically focused debriefing or medication to prevent PTSD and reassess the syndrome if symptoms persist beyond the early period.
03Adjustment pathwayAddress stressor, coping and functionClinically important distress and impaired adaptation follows an identifiable non-traumatic or mixed psychosocial stressor.+
1Confirm that another mental or physical disorder does not better explain the presentation and formulate cultural, relational and practical context.
2Agree targeted problem solving, behavioural re-engagement, sleep and communication work and connect the person with relevant social or occupational support.
3EscalationReview trajectory and risk, treating any emergent comorbid disorder on its own pathway and escalating persistent severe impairment for specialist assessment.