Posttraumatic Stress Disorder
A trauma- and stressor-related disorder involving a characteristic pattern of intrusion, avoidance, negative mood/cognition changes, and arousal/reactivity after qualifying trauma exposure.
Core concept
A trauma- and stressor-related disorder involving a characteristic pattern of intrusion, avoidance, negative mood/cognition changes, and arousal/reactivity after qualifying trauma exposure.
Plain explanation
PTSD is not simply “being upset after trauma.” It is a persistent pattern of trauma-related symptoms across multiple domains that causes clinically significant distress or impairment.
Recognition pattern
Notice the trauma link and the cluster pattern: intrusive re-experiencing, avoidance, negative changes in cognition/mood, and arousal/reactivity.
Development & course
Symptoms can emerge across the lifespan; children may express trauma-related distress through play, behavior, or developmental changes rather than adult-style verbal descriptions.
Functional impact
May disrupt sleep, concentration, relationships, academic/work functioning, and perceived safety.
Associated features
Nightmares, flashbacks, physiological reactivity, avoidance, detachment, hypervigilance, exaggerated startle, and sleep disturbance may occur.
Differential reasoning
Distinguish from acute stress disorder by timing; from generalized anxiety by the trauma-linked symptom organization; from depression by the prominence of trauma-specific intrusion/avoidance.
Culture & context
Trauma expression and help-seeking vary by culture; clinicians should distinguish culturally normative responses from trauma-related impairment.
Common misconceptions
A traumatic event plus anxiety does not automatically establish PTSD; the required symptom pattern and duration must be considered.
Clinical vignette
After a serious accident, a student begins having recurrent distressing dreams, avoids the road where it occurred, becomes hypervigilant, and feels detached from friends for months.
Reconsider
Reconsider the formulation if the duration, impairment, developmental pattern, substance/medical context, or competing diagnosis does not fit the core pattern.
Learn
Learn the four-domain pattern and the central role of trauma-linked intrusion and avoidance.
Notice
Ask: what symptoms are specifically organized around the traumatic event?
Distinguish
PTSD is distinguished by its trauma-linked architecture rather than by anxiety intensity alone.
APA (2022). DSM-5-TR, Trauma- and Stressor-Related Disorders.