Post-Traumatic Stress Disorder (PTSD)

What causes PTSD

PTSD follows exposure to actual or threatened death, serious injury or sexual violence, whether directly, as a witness, by learning it happened to a close person, or through repeated exposure at work (such as first responders). Common traumas include:

• physical or sexual assault, including childhood abuse
• combat and military service
• serious accidents and injuries
• natural disasters and fires
• sudden, violent death of a loved one
• life-threatening illness or traumatic medical experiences, including intensive care and difficult childbirth

Most people who experience trauma do not develop PTSD. Risk is higher with:

• severe, prolonged or repeated trauma, especially interpersonal violence
• previous trauma or childhood adversity
• existing mental health conditions
• lack of social support after the event
• additional stress afterward, such as job loss or injury
• traumatic brain injury

Symptoms

DSM-5 groups PTSD symptoms into four clusters, lasting more than 1 month and causing significant distress or impairment.

1. Re-experiencing (intrusion)

• unwanted, distressing memories
• nightmares
• flashbacks: feeling or acting as if the event is happening again
• intense distress or physical reactions (racing heart, sweating) to reminders

2. Avoidance

• avoiding thoughts, feelings or conversations about the trauma
• avoiding places, people or activities that are reminders

3. Negative changes in thoughts and mood

• trouble remembering parts of the event
• persistent negative beliefs ("I am bad", "the world is completely dangerous")
• self-blame or blaming others
• persistent fear, horror, anger, guilt or shame
• losing interest in activities
• feeling detached or estranged from others
• inability to feel positive emotions

4. Arousal and reactivity

• irritability and angry outbursts
• reckless or self-destructive behavior
• hypervigilance (always on guard)
• being easily startled
• trouble concentrating
• sleep problems

Symptoms usually start within 3 months of the trauma but can be delayed, sometimes by years.

Children

Young children may re-enact the trauma in play, have frightening dreams without clear content, become clingy, or lose skills such as toilet training.

Related conditions

Diagnosis

A doctor or mental health professional diagnoses PTSD through a clinical interview, often using structured tools such as the PCL-5 questionnaire or the CAPS-5 interview. They will also ask about depression, substance use, sleep, physical health and suicide risk.

Treatment

Trauma-focused psychotherapy (first-line)

• Cognitive processing therapy (CPT): identifying and changing unhelpful beliefs about the trauma
• Prolonged exposure (PE): gradually and safely approaching trauma memories and avoided situations
• Eye movement desensitization and reprocessing (EMDR): processing memories while focusing on side-to-side eye movements or other bilateral stimulation
• Trauma-focused cognitive behavioral therapy: especially for children and teens

These typically involve 8 to 16 weekly sessions, and many people no longer meet criteria for PTSD after treatment.

Medicines

• SSRIs: sertraline and paroxetine are FDA-approved for PTSD; fluoxetine is also used
• SNRI: venlafaxine
• Prazosin is sometimes used for trauma-related nightmares, with mixed evidence
• Benzodiazepines are not recommended; they can worsen outcomes and lead to dependence

Other support

• treatment for co-occurring depression, anxiety and substance use
• sleep treatment, including therapy for insomnia and nightmares
• peer support, family involvement and service dogs for some veterans
• exercise, routine and social connection

Living with PTSD

• learn about PTSD and its triggers
• use grounding techniques during flashbacks, such as naming things you can see and hear
• limit alcohol and avoid drugs
• keep a regular sleep schedule
• reach out to trusted people and support groups

Outlook

PTSD can become long-lasting without treatment, but evidence-based therapies lead to significant improvement for most people, even decades after the trauma.

Frequently asked questions

What are the symptoms of PTSD?

PTSD symptoms fall into four groups: re-experiencing the trauma (intrusive memories, nightmares, flashbacks), avoiding reminders, negative changes in thoughts and mood, and being on edge (irritability, startling easily, poor sleep). They last more than a month and affect daily life.

What causes PTSD?

PTSD is caused by exposure to a traumatic event involving actual or threatened death, serious injury or sexual violence. Risk is higher with severe or repeated trauma, past trauma, lack of support and existing mental health conditions.

What is the best treatment for PTSD?

Trauma-focused psychotherapies, such as cognitive processing therapy, prolonged exposure and EMDR, are the most effective treatments. Medicines such as sertraline, paroxetine or venlafaxine also help, especially when therapy is not available or alongside it.

Can PTSD appear years later?

Yes. Although symptoms usually start within 3 months, some people develop delayed-onset PTSD months or years after the trauma, sometimes triggered by a new stress or reminder.

What is the difference between PTSD and complex PTSD?

Complex PTSD usually follows prolonged, repeated trauma, such as childhood abuse or captivity. It includes the core PTSD symptoms plus difficulties with emotional control, a persistently negative self-image and problems in relationships.

Can PTSD be cured?

Many people recover fully or have major improvement with treatment, no longer meeting criteria for PTSD. Some continue to have occasional symptoms, especially under stress, but learn effective ways to manage them.