Trauma- and Stressor-Related Disorders
Acute Stress Disorder
Acute Stress Disorder can occur in the days and weeks following actual or threatened death, serious injury, or sexual violence. It involves a marked combination of intrusion, negative mood, dissociation, avoidance, and arousal symptoms.
Transient posttraumatic stress reactions are common and are not automatically a disorder. Diagnosis requires at least 9 of 14 specified symptoms, a duration of 3 days to 1 month, and clinically significant distress or functional impairment. Help can be requested immediately, regardless of diagnostic time limits.
What Is Acute Stress Disorder?
Eligible exposure includes direct experience, witnessing the event in person, learning that the event occurred to a close relative or friend, or repeated/extreme occupational exposure to aversive details. When it involves the death of a loved one, it must have been violent or accidental. General indirect exposure or viewing of media images is not sufficient, unless it is part of a job. The disorder is not a "failure to process" or a a normal reaction simply given another name: it has a specific threshold and a significant effect.
Key Features and Signs
The 14 symptoms are divided into five categories, without requiring a symptom from each:
- Intrusion: unwanted memories, nightmares, flashbacks, or intense discomfort at reminders.
- Negative mood: persistent inability to experience positive emotions.
- Dissociation: an altered sense of reality or inability to recall an important aspect of the event.
- Avoiding thoughts, feelings, people, places, or activities that remind you of the trauma.
- Arousal: sleep problems, irritability, hypervigilance, difficulty concentrating, and excessive startle response.
- Physical tension, disorientation or difficulty returning to basic daily activities.
How It Is Diagnosed
The assessment looks at the exact type of exposure, number and onset of symptoms, function, physical condition and safety.
- The exposure meets the specific trauma criterion and is not just a general stressor.
- At least 9 of 14 symptoms are present, in any combination from the intrusion, negative mood, dissociation, avoidance, and arousal categories.
- Symptoms last from 3 days to 1 month after the traumatic event and cause clinically significant distress or functional impairment.
- The presentation is not attributable to a substance, drug, or other medical condition, such as traumatic brain injury, and is not better explained by a brief psychotic disorder.
How It Can Affect Daily Life
The person may have difficulty sleeping, concentrating, driving, working, or meeting basic needs. Reminders can trigger a strong physical response, while dissociation may make the environment seem unreal. Practical consequences such as injury, displacement, legal proceedings, or ongoing threat often require immediate support and should not be reduced to 'psychological symptoms.'
Risk and Protective Factors
Acute disorder results from a complex interplay of traumatic exposure, prior experiences, individual vulnerability, and post-event conditions. It does not mean that the person has failed to "assimilate" the trauma. The likelihood of occurrence is influenced by the type and frequency of exposure, as well as by social and biological factors; no single demographic characteristic explains individual response.
Similar or Co-occurring Conditions
Duration and relationship to the event help distinguish:
- Expected acute stress reactions may be severe but do not reach the required threshold or cause the same impairment.
- PTSD requires symptoms of more than 1 month and different distribution across four groups.
- Adjustment Disorder can follow any major stressor when criteria for an acute disorder, PTSD, or other condition are not met.
- Traumatic brain injury, delirium, intoxication, withdrawal, pain, and drugs can cause confusion, amnesia, or agitation.
- Panic, depression, bereavement, and dissociative disorders may co-occur and require separate evaluation.
Treatment and Support
Early care focuses on safety, practical needs and interventions appropriate to severity.
- Practical safety, basic needs, information on common reactions, social support and a follow-up plan are provided.
- For adults with an acute disorder or clinically significant symptoms within the first month, individual trauma-focused cognitive-behavioural therapy may be offered by a trained therapist.
- In children and adolescents, active monitoring or developmentally tailored trauma-focused therapy, with safe caregiver involvement, may be chosen.
- Routine psychologically focused debriefing after trauma is not recommended. Support should be voluntary, responsive to the person’s needs, and should not pressure them to recount the event.
- Physical injuries, pain, sleep problems, substance use, depression and suicide risk are addressed in parallel.
When to Seek Help
Seek support when symptoms are severe, persist for several days, interfere with sleep or basic functioning, or are accompanied by substance use, self-harm, or an inability to remain safe. You don't have to wait three days for help; the limit is only for diagnosis. After the first month, persistent symptoms need re-evaluation and not an assumption that they will "go away".
Frequently Asked Questions
Is 'Acute Anxiety Disorder' the correct name?
No. The established term is Acute Stress Disorder. Anxiety may be part of the presentation, but the disorder also includes intrusion, dissociation, avoidance, negative mood, and arousal symptoms.
Is a symptom required from each category?
No. At least 9 of the 14 symptoms are needed in any combination of the five categories.
Does Acute Stress Disorder always become PTSD?
No. It increases the risk, but many people do not develop PTSD. PTSD can also occur without being preceded by Acute Stress Disorder.