Post-Traumatic Stress Disorder (PTSD)

Post-Traumatic Stress Disorder develops after exposure to actual or threatened death, serious injury, or sexual violence — whether directly experienced, witnessed, learned to have happened to a close family member or friend, or encountered through repeated exposure to distressing details (as in some first-responder professions). It involves four symptom clusters: intrusive re-experiencing of the trauma, avoidance of reminders, negative changes in mood and thinking, and heightened arousal and reactivity, persisting for more than a month and causing significant distress or impairment.

PTSD requires exposure to a qualifying traumatic event, along with at least one intrusion symptom, at least one avoidance symptom, two or more negative alterations in cognition or mood, and two or more alterations in arousal and reactivity, all persisting for more than one month and causing clinically significant distress or impairment, not attributable to a substance or medical condition.

PTSD arises from the interaction between the severity and nature of a traumatic exposure and individual vulnerability factors, including a genetic predisposition (heritability estimated around 30–40%). The traumatic stress response itself produces lasting neurobiological changes, and the likelihood of developing PTSD is strongly influenced by the level of social support available in the aftermath, along with any prior trauma history, which has a cumulative effect on risk.

• Severity, duration, or proximity of the traumatic exposure
• Lack of social support following the traumatic event
• Prior trauma history, particularly childhood trauma
• Pre-existing anxiety or depressive disorders
• Occupations with repeated trauma exposure: first responders, military personnel, journalists
• Lower socioeconomic status
• Dissociation during the traumatic event itself (peritraumatic dissociation), a strong predictor of later PTSD

PTSD involves amygdala hyperactivity, producing an exaggerated fear response, alongside reduced hippocampal volume, which affects the brain's ability to properly contextualize memories as belonging to the past — part of why trauma memories often feel fragmented and intrusively present rather than settled. Reduced regulatory input from the prefrontal cortex over the amygdala further impairs fear-response control, while noradrenergic hyperactivity underlies hyperarousal symptoms and explains why medications targeting this system (such as prazosin) can help with trauma-related nightmares.

• Intrusive distressing memories, flashbacks, or nightmares of the traumatic event
• Intense psychological or physical distress when exposed to trauma reminders
• Avoidance of trauma-related thoughts, feelings, people, places, or conversations
• Inability to recall key aspects of the traumatic event
• Persistent negative beliefs about oneself, others, or the world
• Distorted blame of self or others regarding the trauma
• Diminished interest in activities, detachment from others, inability to experience positive emotions
• Irritability or angry outbursts, reckless or self-destructive behavior
• Hypervigilance and an exaggerated startle response
• Concentration problems and sleep disturbance

• Exposure to actual or threatened death, serious injury, or sexual violence
• One or more intrusion symptoms (flashbacks, nightmares, intrusive memories)
• One or more avoidance symptoms
• Two or more negative alterations in cognition or mood
• Two or more alterations in arousal and reactivity
• Duration of more than 1 month
• Causes significant distress or impairment
• Not attributable to a substance or another medical condition

Conditions a psychiatrist will consider and rule out before confirming this diagnosis:

Acute Stress Disorder

Diagnosed when symptoms have lasted less than one month; if symptoms persist beyond a month, the diagnosis becomes PTSD.

Adjustment Disorder

Diagnosed when the stressor does not meet PTSD's specific trauma threshold (actual or threatened death, serious injury, or sexual violence).

Complex PTSD (ICD-11)

Includes additional disturbances in emotion regulation, self-concept, and relationships, typically following prolonged or repeated trauma.

Major Depressive Disorder

Shares negative mood and cognition changes but lacks the trauma-specific intrusion and avoidance symptoms central to PTSD.

Generalized Anxiety Disorder

Involves worry that is not specifically focused on trauma reminders.

Traumatic Brain Injury

Can produce overlapping cognitive symptoms, particularly important to assess concurrently in combat or accident-related trauma.

• Clinical interview and detailed trauma history
• PTSD Checklist for DSM-5 (PCL-5)
• Clinician-Administered PTSD Scale (CAPS-5), the gold-standard structured interview
• Screening for co-occurring depression, substance use, and suicidality
• Assessment for traumatic brain injury where the mechanism of trauma makes this relevant

Trauma-focused psychotherapy is first-line treatment and has the strongest evidence base, including Trauma-Focused CBT, EMDR, Prolonged Exposure, and Cognitive Processing Therapy. SSRIs or SNRIs are effective medication options, particularly when therapy access is limited or symptoms are severe, and prazosin is specifically useful for trauma-related nightmares.

SSRIs (sertraline, paroxetine)

Specifically approved for PTSD and considered first-line medication.

SNRIs (e.g., venlafaxine)

An effective alternative to SSRIs.

Prazosin

Specifically targets trauma-related nightmares and sleep disturbance.

Benzodiazepines

Generally avoided — evidence suggests they may worsen long-term outcomes, carry dependence risk, and can interfere with the fear-extinction process central to exposure-based therapy.

Trauma-Focused Cognitive Behavioral Therapy

Addresses trauma-related thoughts and gradually processes traumatic memories.

Eye Movement Desensitization and Reprocessing (EMDR)

Uses guided bilateral stimulation while processing traumatic memories; strongly evidence-based despite its distinctive method.

Prolonged Exposure Therapy

Systematic, repeated processing of trauma memories and gradual real-life exposure to avoided trauma reminders.

Cognitive Processing Therapy

Focuses on identifying and challenging unhelpful trauma-related beliefs about safety, trust, and self-blame.

• Maintain a regular sleep routine, even though nightmares may disrupt it
• Learn grounding techniques for managing flashbacks or dissociation in the moment
• Avoid using alcohol or substances to cope with symptoms
• Gradually return to avoided activities and places, guided by a treatment plan, rather than maintaining complete avoidance
• Stay engaged with social support
• Regular physical exercise, which can help regulate stress reactivity

Many people with PTSD improve significantly with trauma-focused therapy, though the disorder can become chronic without treatment. Co-occurring depression and substance use are common and can complicate the course, but early intervention is associated with meaningfully better outcomes.

• Early psychological support after trauma, though formal single-session 'debriefing' is not universally recommended given mixed evidence
• Screening and support for high-risk occupational groups (first responders, military)
• Prompt treatment of acute stress reactions before they become established as chronic PTSD
• Building and maintaining strong social support networks

Avoid pushing someone to 'just talk about it' before they are ready — trauma processing works best at a pace guided by the person and their therapist. Learn basic grounding techniques to help during flashbacks or acute distress. Be patient with avoidance behaviors while supporting gradual, treatment-guided re-engagement with avoided situations, rather than either forcing exposure or enabling complete long-term avoidance. Understand hypervigilance, irritability, and emotional numbing as symptoms of the condition, not personal rejection.

1. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, Text Revision (DSM-5-TR).
2. World Health Organization. International Classification of Diseases, 11th Revision (ICD-11).
3. National Institute for Health and Care Excellence (NICE). Post-traumatic stress disorder.
4. U.S. Department of Veterans Affairs / Department of Defense. Clinical Practice Guideline for PTSD.