Acute Stress Disorder

The short version

●Acute stress disorder (ASD) is diagnosed between 3 days and 1 month after a traumatic event, with intrusion, negative mood, dissociation, avoidance, and arousal symptoms.
●It overlaps heavily with PTSD but is defined by its timing; if symptoms persist beyond a month, the diagnosis becomes PTSD.
●Many intense stress reactions after trauma resolve on their own — ASD is the more severe, impairing end of that range.
●First-line treatment is trauma-focused CBT; routine single-session "debriefing" is not recommended and may be harmful.
●Most medications have little role this early, and benzodiazepines are specifically discouraged.
●Ketamine is not a standard ASD treatment; in the acute window the priority is evidence-based psychotherapy.

Clinical definition

ASD describes characteristic symptoms lasting from 3 days to 1 month after exposure to actual or threatened death, serious injury, or sexual violence. DSM-5 requires nine or more symptoms across five categories — intrusion, negative mood, dissociation, avoidance, and arousal. It was introduced partly to identify people at risk of PTSD, though it is an imperfect predictor: many who develop PTSD never met ASD criteria, and many with ASD recover. Its defining feature is timing — the first month after trauma — distinguishing it from PTSD (symptoms beyond a month) and from normal, self-limiting stress reactions.

How it differs from related conditions

vs. PTSD

Same symptom domains, but PTSD is diagnosed when symptoms persist beyond one month. ASD is the acute-window diagnosis.

vs. Adjustment disorder

A stress response to a (often non-traumatic) life stressor, without the trauma criterion or full symptom profile of ASD.

vs. Complex PTSD

Follows prolonged or repeated trauma with added disturbances in self-organization, distinct from the acute, single-window ASD.

First-line treatments

Trauma-focused CBT

The best-supported treatment for ASD and for reducing progression to PTSD.

Watchful waiting + support

For milder reactions, practical and social support with monitoring, since many resolve naturally.

Sleep and safety stabilization

Restoring sleep, safety, and routine with brief, targeted help rather than forced debriefing.

Avoid benzodiazepines

Discouraged acutely — they do not prevent PTSD and may worsen outcomes.

When standard treatments fail

When symptoms persist beyond a month, the diagnosis becomes PTSD and treatment shifts to a full course of trauma-focused therapy (prolonged exposure, CPT, EMDR) and, where needed, an SSRI. Early single-session debriefing is not recommended. Rapid-acting agents like ketamine remain investigational in trauma and are not part of standard acute-stress care.

Where ketamine fits

Ketamine is not an established treatment for acute stress disorder. In the acute window after trauma, the evidence points firmly to trauma-focused psychotherapy, with most medications playing little role and benzodiazepines specifically discouraged. Ketamine is being studied in PTSD (where it has randomized support in chronic illness), and there is interest in whether it could influence trauma-memory consolidation — but there is no basis for using it as a first-line ASD treatment. Where a separate, established depression co-occurs, that may be treated on its own terms; the acute trauma reaction itself is best addressed with therapy.

Where this fits with Tovani

Tovani's focus is established mood, anxiety, PTSD, and pain conditions — not the acute trauma window, where the right care is prompt trauma-focused therapy and support. If you are in the first weeks after a trauma, that is the priority; if symptoms persist past a month and become PTSD, that is where treatments including ketamine (alongside trauma-focused therapy) may enter the conversation. If you are in crisis, call or text 988.

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Frequently asked

Will my acute stress disorder turn into PTSD?

Not necessarily. ASD raises the risk but is an imperfect predictor: many people with ASD recover, and some who develop PTSD never had ASD. Trauma-focused CBT in the first weeks is the best way to reduce the chance of progression.

What's the difference between acute stress disorder and PTSD?

Mainly timing. ASD is diagnosed in the first month after a trauma (3 days to 4 weeks); if symptoms persist beyond a month, the diagnosis becomes PTSD. The symptoms themselves overlap heavily.

Can ketamine help right after a trauma?

It is not a standard treatment for the acute window. The evidence supports trauma-focused therapy first, and benzodiazepines are specifically discouraged. Ketamine has randomized support in chronic PTSD, not in the first weeks after trauma.

What should I do in the first weeks after a trauma?

Prioritize safety, sleep, and support, and connect with a trauma-focused therapist. Avoid forced "debriefing." Many intense reactions settle on their own; trauma-focused CBT helps when they don't. If you are in crisis, call or text 988.

References

Bryant RA 2021, Clinical Psychology Review — Review of mechanisms of adaptation to trauma, relevant to ASD and its progression to PTSD. (PMID 33588312)
Roberts NP et al. 2019, European Journal of Psychotraumatology — Systematic review of early psychological intervention following recent trauma. (PMID 31853332)
Roberts NP et al. 2010, Cochrane Database of Systematic Reviews — Early psychological interventions to treat acute traumatic stress symptoms. (PMID 20238359)

Last reviewed by Dr. Ben Soffer, DO on June 2, 2026. This page is educational and not a substitute for clinical evaluation. A physician determines whether ketamine therapy is appropriate for your specific situation.