Post-traumatic stress disorder is one of the most recognized mental health conditions in the United States, yet it is also one of the most frequently misquoted. Ask how common it is and you will get answers ranging from “rare” to “an epidemic,” often depending on whether the person is thinking about the general public or about combat veterans specifically. The honest answer requires holding both pictures at once.
According to the National Institute of Mental Health, an estimated 3.6% of U.S. adults have PTSD in a given year, and 6.8% will experience it at some point in their lives (NIMH). Those figures come from the National Comorbidity Survey Replication (NCS-R), the most recent nationally representative diagnostic-interview study NIMH publishes for PTSD, with data collected in 2001–2003. NIMH reports these as percentages only and does not publish an official population count for PTSD, so any headline “number of people” figure you see elsewhere is an estimate rather than a federal count.
This article walks through what those numbers mean — how PTSD prevalence breaks down by sex, severity, and age, why rates run higher among veterans, and how the U.S. picture compares globally. For a fuller clinical overview, see our pillar page on PTSD and the detailed post-traumatic stress disorder reference.
If you or someone you know is struggling or in crisis, help is available. Call or text 988 to reach the 988 Suicide & Crisis Lifeline, available 24/7.
How Common Is PTSD Among U.S. Adults?
The two anchor figures are worth stating plainly:
| Measure | Prevalence | Source |
|---|---|---|
| Past-year PTSD, adults 18+ | 3.6% | NCS-R (NIMH) |
| Lifetime PTSD, adults 18+ | 6.8% | NCS-R (NIMH) |
An important caveat travels with these numbers. Unlike depression, which the federal government re-measures every year through the National Survey on Drug Use and Health, PTSD prevalence in the general population is not tracked annually with a diagnostic interview. The 3.6% and 6.8% figures are the most recent nationally representative estimates NIMH publishes, and they were collected in 2001–2003. They remain the standard reference precisely because no newer study of comparable scope has replaced them — but they should not be read as brand-new, current-year data.
Because NIMH publishes only percentages, there is no official count of how many Americans have PTSD. As a rough illustration, applying the 3.6% past-year rate to today’s adult population would translate to somewhere on the order of nine million adults in any given year, and the 6.8% lifetime rate to roughly eighteen million — but treat those as back-of-the-envelope approximations, not published totals.
PTSD by Sex
One of the most consistent findings in the PTSD literature is the gap between women and men. Women are diagnosed at nearly three times the rate of men:
| Group | Past-year PTSD |
|---|---|
| Women | 5.2% |
| Men | 1.8% |
That roughly 3-to-1 ratio (NIMH) reflects both differences in the types of trauma more commonly experienced — including sexual assault and interpersonal violence — and differences in how PTSD develops after exposure. It is a large enough gap that PTSD is often discussed as a condition that disproportionately affects women, even though men also develop it in substantial numbers.
PTSD Severity
Prevalence counts anyone who meets diagnostic criteria, but severity varies widely. Among adults with past-year PTSD, NIMH classifies impairment roughly into thirds:
| Severity | Share of adults with past-year PTSD |
|---|---|
| Serious | 36.6% |
| Moderate | 33.1% |
| Mild | 30.2% |
In other words, more than a third of people with active PTSD experience serious impairment (NIMH) — a reminder that this is not a diagnosis where most cases are mild. That distribution helps explain why PTSD weighs heavily on work, relationships, and physical health even though its overall prevalence is lower than that of anxiety or depression.
PTSD in Adolescents
PTSD is not confined to adulthood. Data from the National Comorbidity Survey Adolescent Supplement (NCS-A), collected in 2001–2004 and still the most recent nationally representative diagnostic estimate NIMH publishes for teens, put lifetime PTSD among adolescents aged 13–18 at 5.0%, with 1.5% experiencing severe impairment (NIMH).
The sex gap appears early and is even wider than among adults:
| Group (ages 13–18) | Lifetime PTSD |
|---|---|
| Girls | 8.0% |
| Boys | 2.3% |
Girls are diagnosed at roughly three and a half times the rate of boys (NIMH). As with the adult figures, these adolescent estimates are now two decades old and should be read as the best available diagnostic benchmark rather than a current-year measurement. For a broader look at how mental health conditions affect younger people, see our teens population overview.
PTSD Among Veterans
Military service raises the odds of exposure to the kinds of events that cause PTSD, and the data reflect it. The VA’s National Center for PTSD estimates that about 7% of veterans will have PTSD at some point in their lives, compared with roughly 6% of the general adult population (VA, 2025). Among veterans, the same sex pattern holds and is pronounced: an estimated 13% of female veterans experience PTSD in their lifetime versus about 6% of male veterans (VA, 2025).
The single biggest driver of variation among veterans is service era, which tracks closely with combat exposure:
| Service era | Past-year PTSD | Lifetime PTSD |
|---|---|---|
| OEF/OIF (Iraq/Afghanistan) | 15% | 29% |
| Persian Gulf War | 14% | 21% |
| Vietnam War | 5% | 10% |
| World War II & Korea | 2% | 3% |
Deployment itself is a major factor: veterans who deployed to a war zone are at roughly three times the risk of PTSD compared with non-deployed veterans of the same era (VA, 2025).
The rates look different again when you narrow to veterans actively receiving VA health care. Among the roughly 5.8 million veterans served through VA care in fiscal year 2024, an estimated 14% of men and 24% of women were diagnosed with PTSD (VA, 2025). Those figures run higher than the population-wide veteran estimates in part because veterans seeking care are more likely to have a diagnosable condition than veterans overall.
Elevated PTSD is closely tied to other risks in this population, which is why it is treated as a distinct priority rather than folded into general adult statistics. Our dedicated pages on veteran PTSD and the broader veterans population go deeper, and the connection to suicide risk is covered in our veteran suicide statistics breakdown.
PTSD Worldwide
The United States is not an outlier. Drawing on the WHO World Mental Health Surveys across more than two dozen countries, researchers estimate cross-national lifetime PTSD at 3.9% of the total population, rising to 5.6% among people who have actually been exposed to a traumatic event (Koenen et al., 2017). The gap between those two numbers underscores a basic point about PTSD: it is a disorder of response to trauma, so its prevalence depends heavily on how much trauma a population has faced and who within it was exposed.
A Note on Treatment Rates
One figure readers often look for is not available from these primary sources: a single, clean U.S. PTSD treatment rate. NIMH and the VA publish prevalence and severity data, but neither issues a comparable nationally representative statistic for the share of Americans with PTSD who receive treatment for it. We flag this as a genuine data gap rather than fill it with a number that these sources do not support. For related context on how many people go untreated across conditions, our national mental health overview is a useful starting point.
PTSD also carries elevated suicide risk, which is one reason it is tracked so closely among veterans and trauma-exposed populations. For the wider national context, see our complete U.S. suicide statistics breakdown.
Frequently Asked Questions
How many people have PTSD in the United States?
An estimated 3.6% of U.S. adults have PTSD in a given year, and 6.8% experience it over their lifetime (NIMH). These come from the NCS-R, the most recent nationally representative diagnostic study NIMH publishes for PTSD (data collected 2001–2003). NIMH reports percentages only and does not publish an official population count.
Is PTSD more common in women or men?
Women. Past-year PTSD affects about 5.2% of women versus 1.8% of men — nearly a 3-to-1 gap (NIMH). Among adolescents the gap is similar, with girls at 8.0% lifetime versus 2.3% for boys.
How common is PTSD among veterans?
About 7% of veterans experience PTSD in their lifetime, slightly above the roughly 6% general-population figure (VA, 2025). Rates vary sharply by era, from 29% lifetime among OEF/OIF veterans to 3% among WWII and Korea veterans, and deployment roughly triples the risk.
What share of veterans in VA care have PTSD?
Among the roughly 5.8 million veterans served through VA care in fiscal year 2024, an estimated 14% of men and 24% of women were diagnosed with PTSD (VA, 2025).
How severe is PTSD when someone has it?
Among adults with past-year PTSD, about 36.6% have serious impairment, 33.1% moderate, and 30.2% mild (NIMH) — meaning more than a third of active cases are serious.
How common is PTSD globally?
Across the WHO World Mental Health Surveys, lifetime PTSD is estimated at 3.9% of the total population and 5.6% among people exposed to trauma (Koenen et al., 2017).
Sources
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National Institute of Mental Health. Post-Traumatic Stress Disorder (PTSD). NIMH. https://www.nimh.nih.gov/health/statistics/post-traumatic-stress-disorder-ptsd
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U.S. Department of Veterans Affairs, National Center for PTSD. How Common is PTSD in Veterans? VA; 2025. https://www.ptsd.va.gov/understand/common/common_veterans.asp
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Koenen KC, Ratanatharathorn A, Ng L, et al. Posttraumatic stress disorder in the World Mental Health Surveys. Psychol Med. 2017;47(13):2260-2274. https://pubmed.ncbi.nlm.nih.gov/28385165/