Chart — Mental Health
Acute Stress Disorder vs PTSD
Same trauma response, different clock. Acute stress disorder runs from 3 days to 1 month after the event; once symptoms persist beyond a month, it is PTSD.
Educational use only. Diagnosis and trauma-focused therapy are provider-directed. This chart is an educational comparison aid. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Side by Side
| Feature | Acute stress disorder | PTSD |
|---|---|---|
| Trigger | Exposure to actual/threatened death, serious injury, or sexual violence | Same — experienced, witnessed, or learned of |
| Onset / timing | Symptoms begin and last 3 DAYS to 1 MONTH after the event | Symptoms persist LONGER than 1 month (may begin later — delayed onset) |
| Symptom clusters | Intrusion, avoidance, negative mood, dissociation, arousal | Intrusion, avoidance, negative cognition/mood, hyperarousal (4 clusters) |
| Dissociation | Often prominent (numbing, derealization, amnesia) | May occur; not required |
| Relationship | Can resolve, or progress to PTSD if symptoms persist past 1 month | The persistent disorder; often preceded by ASD |
| First-line treatment | Trauma-focused CBT; psychological first aid; usually no benzodiazepines | Trauma-focused psychotherapy (CPT, PE, EMDR) + SSRIs/SNRIs; prazosin for nightmares; avoid benzodiazepines |
Exam Traps
- ✦The discriminator is TIME: ASD = 3 days to 1 month; PTSD = symptoms lasting more than 1 month.
- ✦Both share the same trauma response and overlapping symptoms; ASD can progress to PTSD.
- ✦The four PTSD clusters: intrusion/re-experiencing, avoidance, negative cognition/mood, hyperarousal.
- ✦PTSD meds: SSRIs/SNRIs first-line; prazosin for nightmares; benzodiazepines are generally avoided.
- ✦During a flashback (either disorder): keep the patient safe and ground/orient to the present.
- ✦Always screen for suicide and substance use — both commonly co-occur.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Psychiatric Association (DSM-5-TR) · American Psychiatric Nurses Association (APNA) · SAMHSA. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →