Condition

PTSD and Trauma: Symptoms, Types, and Treatment

Summary

Post-traumatic stress disorder (PTSD) develops after a traumatic event, with symptoms that persist more than a month and interfere with daily life. About 6 of every 100 U.S. adults will have PTSD in their lifetime, and women are affected at roughly twice the rate of men. Most people exposed to trauma do not develop it. Trauma-focused psychotherapies — cognitive processing therapy, prolonged exposure, and EMDR — have the strongest evidence.

Written by Gale Editorial · grounded in the cited clinical sources below · Updated 2026-07-07. How we write.

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What is PTSD?

Post-traumatic stress disorder (PTSD) is a trauma- and stressor-related condition that can develop after a person is exposed to actual or threatened death, serious injury, or sexual violence — through direct experience, witnessing it happen to someone else, learning that it happened to a close family member or friend, or repeated exposure to the details of trauma, as first responders often face 3.

Most people have some difficulty after a frightening or life-threatening event, and for many those reactions fade over the following weeks. PTSD is diagnosed when the symptoms persist for more than one month after the trauma and interfere with relationships, work, or daily functioning 3. It is the persistence and the disruption — not the strength of the initial reaction — that distinguishes an ordinary stress response from the disorder.

About 6 of every 100 U.S. adults (6%) will have PTSD at some point in their lives, and roughly 13 million Americans had PTSD in 2020 2. The National Institute of Mental Health estimates a lifetime prevalence of 6.8% 1. Most people exposed to a traumatic event never develop the condition.

PTSD, complex PTSD, and acute stress disorder

Three related diagnoses describe trauma responses that differ in timing and pattern.

Acute stress disorder (ASD) describes a trauma response in the first month. It is diagnosed when symptoms last between 3 days and 1 month after the event, with at least 9 symptoms present across five categories — intrusion, negative mood, dissociation, avoidance, and arousal 7. If a full symptom pattern is still present after one month, the diagnosis becomes PTSD 7.

PTSD is the diagnosis when symptoms persist beyond a month and meet full criteria across the symptom clusters described below 3.

Complex PTSD (C-PTSD) was added as a distinct diagnosis in the World Health Organization's ICD-11, published in 2022 6. It typically follows prolonged or repeated trauma from which escape is difficult — childhood abuse, domestic violence, captivity — and includes the core features of PTSD plus lasting disturbances in how a person manages emotions, sees themselves, and relates to others 6. Complex PTSD is not a separate category in the U.S. diagnostic manual (DSM-5), where those features fall under PTSD. Standard PTSD treatments work well whether a person has PTSD or complex PTSD 6.

The four symptom clusters

The DSM-5 organizes PTSD symptoms into four clusters; a diagnosis requires symptoms from each 3.

Intrusion (re-experiencing). The event is persistently re-lived through unwanted, distressing memories, recurrent nightmares, flashbacks in which the person feels the event is happening again, and intense psychological or physical distress when reminded of it 3.

Avoidance. Deliberate effort to avoid trauma-related thoughts and feelings, or external reminders — people, places, conversations, or situations that bring the event to mind 3.

Negative alterations in thoughts and mood. Persistent negative beliefs about oneself or the world, distorted self-blame, ongoing fear, horror, anger, guilt or shame, loss of interest in activities, feeling detached from others, and an inability to experience positive emotions 3.

Alterations in arousal and reactivity. Irritability or angry outbursts, reckless or self-destructive behavior, hypervigilance, an exaggerated startle response, difficulty concentrating, and sleep disturbance 3.

DSM-5 also recognizes a dissociative subtype, marked by depersonalization (feeling detached from oneself) or derealization (a sense that surroundings are unreal), in addition to the core symptoms 3.

How common is PTSD, and who is at risk

In any given year, an estimated 3.6% of U.S. adults meet criteria for PTSD, according to the National Institute of Mental Health 1; the Department of Veterans Affairs puts the annual figure closer to 5%, and estimates vary with the survey and population studied 2.

Women are affected at roughly twice the rate of men. About 8 of every 100 women and 4 of every 100 men will have PTSD in their lifetime 2. Past-year prevalence follows the same pattern — 5.2% in women versus 1.8% in men 1. PTSD can also be seriously disabling: among adults with PTSD in a given year, an estimated 36.6% had serious impairment and another 33.1% had moderate impairment 1.

Most people exposed to trauma do not develop PTSD. In the WHO World Mental Health Surveys across 24 countries, 70.4% of people reported at least one traumatic event in their lifetime, yet the overall conditional risk of PTSD after a given trauma was about 4.0% 8. Risk depends heavily on the type of event. It was highest after rape (19.0%), physical abuse by an intimate partner (11.7%), being kidnapped (11.0%), and sexual assault other than rape (10.5%) 8. Interpersonal and sexual violence — which women are more likely to experience — carry substantially higher risk than accidents or disasters 82.

Trauma-focused psychotherapies

The treatments with the strongest evidence for PTSD are trauma-focused psychotherapies — structured, time-limited talk therapies that help a person process the memory and the beliefs that formed around it. The American Psychological Association's clinical practice guideline gives its strongest recommendations to three variations of cognitive behavioral therapy 4.

Cognitive processing therapy (CPT) helps a person identify and reframe the distorted beliefs that trauma often produces — about safety, trust, control, and self-blame.

Prolonged exposure (PE) works by gradually and repeatedly approaching trauma memories and avoided but safe situations, so that reminders lose their power to trigger fear.

Cognitive behavioral therapy (CBT) for PTSD combines these cognitive and exposure-based elements.

EMDR (eye movement desensitization and reprocessing) receives a conditional recommendation in the APA guideline, alongside cognitive therapy 4. A Cochrane systematic review found that both individual trauma-focused CBT and EMDR reduced clinician-rated PTSD symptoms more than waitlist or usual care, and that both were superior to non-trauma-focused therapies at one-to-four-month follow-up 5. The review's authors noted the underlying evidence was of very low quality and should be read with that caution 5.

Medications and other approaches

Medication is an alternative or an addition to psychotherapy, and it is useful when trauma-focused therapy is unavailable or not preferred. In the APA guideline, medication receives a conditional recommendation, while the trauma-focused psychotherapies receive the strongest ones 4.

SSRIs are the best-studied medications for PTSD. Sertraline and paroxetine are the only two medications FDA-approved specifically for PTSD; fluoxetine (another SSRI) and venlafaxine (an SNRI) are also suggested options 4. These medications generally take several weeks to produce meaningful benefit.

Medication and psychotherapy are often combined. Because complex PTSD responds to the same evidence-based treatments as PTSD, a diagnosis of complex PTSD does not require a fundamentally different approach 6.

What to expect when seeking care

Assessment begins with a clinical interview covering the traumatic event, when symptoms began, and how they affect daily life, mapped against the four DSM-5 symptom clusters 3. Structured self-report measures are commonly used to gauge severity and to track change over the course of treatment.

A psychologist, psychiatrist, licensed clinical social worker, or licensed counselor trained in a trauma-focused therapy such as CPT, PE, or EMDR is the appropriate provider for structured trauma treatment; a primary care physician or psychiatrist can assess and prescribe medication. Trauma-focused therapies are delivered as a defined course of regular sessions, and improvement is typically tracked with the same measures used at intake. Trauma-focused psychotherapies are the best-supported route to improvement 4, and the goal is a durable reduction in symptoms and a return to valued activities and relationships.

Example practice profiles

5 example practice profiles focus on trauma & PTSD →

Common questions

Both share the core features of PTSD. Complex PTSD (C-PTSD), a diagnosis added to the WHO's ICD-11 in 2022, typically follows prolonged or repeated trauma that is hard to escape — such as childhood abuse or domestic violence — and adds lasting difficulties with regulating emotions, a negative self-image, and trouble maintaining relationships. Complex PTSD is not a separate category in the U.S. DSM-5, where those features are captured within PTSD. Standard PTSD treatments work well for both.

Acute stress disorder describes a trauma response in the first month after the event. It is diagnosed when symptoms last between 3 days and 1 month. If a full symptom pattern is still present after one month, the diagnosis becomes PTSD. Not everyone who develops PTSD had acute stress disorder first, and not everyone with acute stress disorder goes on to develop PTSD.

Trauma-focused psychotherapies have the strongest evidence. The American Psychological Association's clinical practice guideline gives its strongest recommendations to cognitive behavioral therapy, cognitive processing therapy (CPT), and prolonged exposure (PE). EMDR and cognitive therapy receive conditional recommendations. Medications such as sertraline and paroxetine are also effective options. Responses vary by individual, and many people try more than one approach before finding the right fit.

Yes. EMDR (eye movement desensitization and reprocessing) receives a conditional recommendation in the APA guideline, and a Cochrane systematic review found it reduced PTSD symptoms more than waitlist or usual care and was comparable to trauma-focused CBT. The Cochrane authors noted the underlying evidence was of very low quality, so findings should be read with that caution.

No. Trauma-focused psychotherapy alone is effective for many people and receives the strongest recommendations in the APA guideline. Medication — most often an SSRI such as sertraline or paroxetine, the two agents FDA-approved for PTSD — is a reasonable alternative or addition, particularly when therapy is unavailable or not preferred. Medication and psychotherapy are often combined.

No. Most people exposed to trauma do not develop PTSD. Across the WHO World Mental Health Surveys, about 70% of people reported at least one lifetime traumatic event, but the overall conditional risk of PTSD after a given trauma was about 4%. Risk is higher after interpersonal and sexual violence — for example, roughly 19% after rape — than after accidents or disasters.

Seek urgent help when there are thoughts of suicide or self-harm (call or text 988), when flashbacks or dissociation create immediate danger, or when alcohol or other substances are being used to cope with symptoms. PTSD that persists beyond a month and interferes with work, relationships, or daily life warrants evaluation by a clinician even when there is no emergency.

Related conditions

Anxiety: Symptoms, Types, and Treatment · Depression: Signs, Causes, and Treatment · Substance Use Disorder: Spectrum, Diagnosis, and Treatment · Grief and Prolonged Grief Disorder: When Grief Becomes a Disorder

Specialties

Behavioral Health: What Therapists and Psychiatrists Treat

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When to seek care

  • —Thoughts of suicide or self-harm — call or text 988 immediately
  • —Thoughts of harming others
  • —Flashbacks or dissociative episodes that put you or others in immediate danger
  • —Using alcohol or other substances to cope with trauma symptoms or numb memories
  • —Symptoms that have persisted more than a month and interfere with work, relationships, or daily life
  • —New or worsening symptoms after a fresh trauma, loss, or major life change

If you are having thoughts of suicide or self-harm, call or text 988 (Suicide and Crisis Lifeline, available 24/7). For a substance-use crisis, call SAMHSA's National Helpline at 1-800-662-4357 (free, confidential, 24/7). Call 911 for imminent danger to yourself or others.

General health information, not medical advice. Synthetic demonstration content.

References

  1. 1.National Institute of Mental Health (NIMH) (2024). Post-Traumatic Stress Disorder (PTSD): Statistics. NIMH. link ✓Past-year PTSD prevalence 3.6% in U.S. adults (females 5.2%, males 1.8%); lifetime prevalence 6.8%; among past-year cases 36.6% serious impairment and 33.1% moderate impairment; adolescent lifetime prevalence 5.0%
  2. 2.U.S. Department of Veterans Affairs, National Center for PTSD (2023). How Common is PTSD in Adults?. National Center for PTSD. link ✓About 6% of U.S. adults have PTSD in their lifetime and about 5% in a given year (roughly 13 million in 2020); women (8%) affected at about twice the rate of men (4%); higher rates in women linked partly to greater exposure to trauma such as sexual assault
  3. 3.U.S. Department of Veterans Affairs, National Center for PTSD (2024). PTSD and DSM-5. National Center for PTSD. link ✓DSM-5 PTSD criteria: Criterion A trauma exposure definition; four symptom clusters (intrusion, avoidance, negative alterations in cognitions and mood, alterations in arousal and reactivity); duration greater than one month; dissociative subtype (depersonalization/derealization)
  4. 4.American Psychological Association (2017). Clinical Practice Guideline for the Treatment of Posttraumatic Stress Disorder (PTSD) in Adults. American Psychological Association. link ✓Strong recommendations for cognitive behavioral therapy, cognitive processing therapy, and prolonged exposure; conditional recommendations for cognitive therapy and EMDR; sertraline and paroxetine FDA-approved for PTSD, with fluoxetine and venlafaxine also suggested
  5. 5.Bisson JI, Roberts NP, Andrew M, Cooper R, Lewis C (2013). Psychological therapies for chronic post-traumatic stress disorder (PTSD) in adults. Cochrane Database of Systematic Reviews. doi:10.1002/14651858.CD003388.pub4 ✓Individual trauma-focused CBT and EMDR reduced clinician-assessed PTSD symptoms more than waitlist/usual care and were superior to non-trauma-focused therapy at one-to-four-month follow-up; underlying evidence rated very low quality
  6. 6.U.S. Department of Veterans Affairs, National Center for PTSD (2024). Complex PTSD. National Center for PTSD. link ✓Complex PTSD added to ICD-11 (2022); follows prolonged or repeated interpersonal trauma; adds disturbances in emotion regulation, self-concept, and relationships beyond core PTSD; not a separate DSM-5 category; standard PTSD treatments work for both PTSD and complex PTSD
  7. 7.Fanai M, Khan MAB (2023). Acute Stress Disorder. StatPearls. link ✓Acute stress disorder diagnosed when symptoms last between 3 days and 1 month after trauma, with at least 9 symptoms across five categories (intrusion, negative mood, dissociation, avoidance, arousal); symptoms persisting beyond one month meet PTSD criteria
  8. 8.Kessler RC, Aguilar-Gaxiola S, Alonso J, et al. (2017). Trauma and PTSD in the WHO World Mental Health Surveys. European Journal of Psychotraumatology. doi:10.1080/20008198.2017.1353383 ✓Across 24 countries, 70.4% reported lifetime trauma exposure; overall conditional risk of PTSD after a trauma about 4.0%; highest conditional risk after rape (19.0%), intimate-partner physical abuse (11.7%), kidnapping (11.0%), and non-rape sexual assault (10.5%)

https://www.gale.care/conditions/trauma-ptsd · 8 sources. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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