Post-traumatic stress disorder is a pattern that develops after exposure to actual or threatened death, serious injury, or sexual violence, and persists for more than a month with four symptom clusters: intrusion, avoidance, negative changes in mood and cognition, and altered arousal. Most people with PTSD didn't develop it in combat; the condition follows many kinds of traumatic exposure. Trauma-focused therapies (prolonged exposure, cognitive processing therapy, EMDR) and SSRIs have the strongest evidence; real recovery is the expected outcome with adequate treatment.
PTSD has a public image shaped largely by combat scenes in films. The clinical reality is broader and quieter. The majority of people with PTSD didn't develop it in combat. Many have it from events that, on the surface, looked smaller than the diagnosis would suggest.
What PTSD is
Post-traumatic stress disorder is defined in the DSM-5-TR by exposure to actual or threatened death, serious injury, or sexual violence, either through direct experience, witnessing, learning that it happened to a close loved one, or repeated exposure to aversive details (such as in first responders or certain professionals). After the exposure, four clusters of symptoms develop and persist for more than one month: intrusion (such as nightmares, flashbacks, intrusive memories), avoidance (of reminders, internal or external), negative alterations in cognitions and mood, and alterations in arousal and reactivity (such as hypervigilance, exaggerated startle, sleep difficulty).
PTSD is now classified in DSM-5-TR within trauma- and stressor-related disorders, no longer grouped with the anxiety disorders. The lifetime prevalence in the U.S. is approximately six percent, with rates roughly two to three times higher in women than in men.
The eleventh edition of the International Classification of Diseases (ICD-11) also recognizes complex PTSD, which adds three features (disturbances in self-organization: affect regulation difficulty, negative self-concept, relational disturbance) to the core picture and is typically associated with prolonged or repeated trauma.
How it tends to present
The presentation can be subtle or dramatic. Many people don't connect their symptoms to the event that produced them, particularly if the event happened years ago or if it doesn't match the cultural picture of trauma.
Common features:
Intrusive memories that arrive without warning, sometimes triggered by sensory cues (a smell, a sound, a particular angle of light) and sometimes by no clear trigger. The memories often carry the full emotional intensity of the original event.
Nightmares that reproduce elements of the event, sometimes literally, sometimes in altered form.
Avoidance behaviors: of the place where the event occurred, of conversations about it, of internal thoughts or feelings that bring it close. Avoidance often becomes the most visible feature of the condition.
A general sense of being unsafe even in safe settings. Hypervigilance. Easy startle. A sense that something is going to happen.
Sleep that's light and easily disturbed.
Negative beliefs about oneself or the world that the person didn't hold before the event. "It was my fault." "No one can be trusted." "The world is dangerous." These aren't depression, though depression often coexists.
Dissociative features in some cases: feeling detached from the body or from the surroundings, sometimes with periods of lost time.
How it's diagnosed
Diagnosis is made on history. The clinician asks about the traumatic exposure, the symptoms in each of the four clusters, the duration, and the impact on daily life. The Clinician-Administered PTSD Scale (CAPS-5) is the most widely used structured interview for PTSD in research and is treated as the reference instrument by the National Center for PTSD. The PTSD Checklist (PCL-5) is a widely used self-report screen.
A careful diagnosis distinguishes PTSD from acute stress disorder (which involves similar symptoms in the first month after the event) and from adjustment disorders. Co-occurring conditions are common, particularly major depression, substance use disorders, and other anxiety conditions.
How it's treated
PTSD has unusually strong evidence for several specific psychotherapies.
Trauma-focused cognitive behavioral therapy is an umbrella term for several closely related approaches that share a common core: structured processing of the traumatic memory, identification and revision of trauma-related beliefs, and graded exposure to avoided reminders. The most studied versions are cognitive processing therapy (CPT) and prolonged exposure therapy (PE). Both produce substantial improvement in most patients within twelve to sixteen sessions, and both have durable outcomes.
Eye movement desensitization and reprocessing (EMDR) is a different approach with strong evidence, in which the patient briefly recalls aspects of the traumatic memory while engaging in bilateral stimulation (eye movements, tapping, or sounds). The mechanism is still debated. The outcomes are well-replicated.
SSRIs and SNRIs are first-line pharmacologic treatments. sertraline and paroxetine are FDA-approved for PTSD. venlafaxine has good supporting evidence. Medication is most often added when therapy alone has been insufficient or when co-occurring depression or anxiety is prominent.
Prazosin, an alpha-blocker originally developed for blood pressure, has evidence for reducing trauma-related nightmares and is sometimes used as an adjunct.
Several other interventions have been studied with mixed results. MDMA-assisted therapy and ketamine-based approaches have shown promise in research settings and aren't yet standard care. Trauma-focused yoga and certain mindfulness-based interventions show modest benefit as adjuncts.
What gets in the way
Avoidance is built into the condition, and avoidance interferes with treatment. The therapies that work require the patient to approach the memory rather than avoid it. This is one of the reasons that early dropout from PTSD treatment is common. A skilled therapist paces the work so that the approach is tolerable.
A second obstacle is the misconception that revisiting the trauma will worsen things. The evidence-based therapies are designed specifically to allow processing of the memory in a way that reduces its emotional charge, not to retraumatize. Patients who complete a full course of treatment usually report meaningful relief.
What to know about the long arc
PTSD is highly treatable. The majority of patients who complete an evidence-based course of therapy experience substantial improvement, and many no longer meet criteria for the disorder. Recovery doesn't necessarily mean forgetting the event. It means the memory becomes a memory rather than an active wound.
Untreated, PTSD often becomes chronic, with secondary problems that compound over years. The most useful step, often, is connecting with a clinician trained in trauma-focused work.
For the clinical encyclopedia entry on this condition, see Shrinkopedia →
This topic across the entire Shrink Network → Trauma Cluster on Shrinkopedia