PTSD — post-traumatic stress disorder — is often associated with images of combat veterans returning from war. That association isn't wrong, but it's incomplete. Mental health professionals have long known that PTSD can develop after any life-threatening or deeply distressing experience, not just military service, and it's more common than many people realize.
What Is PTSD?
According to the National Institute of Mental Health, an estimated 3.6% of U.S. adults experience PTSD in a given year, and about 6.8% will experience it at some point in their lives — roughly 1 in 15 people. People with PTSD have a hard time recovering after experiencing or witnessing a terrifying or life-threatening event. Left untreated, PTSD symptoms can persist for years, and when triggered, the original event can feel like it's happening again, often with intense emotional and physical reactions. People with PTSD may feel real fear or stress even when they're not actually in danger.
These triggering events can include domestic violence, serious accidents, violent crime, natural disasters, or military combat — and, for some people, the sudden or unexpected death of someone close to them. It's normal to feel shaken after something like this, and for most people, that anxiety fades with time. For people with PTSD, though, the distress doesn't fade the same way — it keeps returning through nightmares, intrusive memories, and flashbacks, often making relationships and everyday tasks much harder.
Symptoms of PTSD
Fear triggers a natural "fight-or-flight" response meant to protect us from danger, and most people recover from a traumatic event's initial symptoms as time passes. According to the National Institute of Mental Health, people whose symptoms don't fade — and instead persist or worsen — may be experiencing PTSD.
Not everyone who goes through a traumatic event develops PTSD, whether short-term (acute) or long-term (chronic), and not everyone with PTSD has faced physical danger; grief after a sudden, unexpected loss can trigger it too. Some of the main symptoms of PTSD include:
PTSD and Depression
PTSD rarely occurs on its own. Research pooling data across dozens of studies has found that roughly half of people who have had PTSD at some point in their lives also experience major depressive disorder, and people with a history of PTSD are several times more likely to develop depression than people without it.
The relationship between trauma exposure and depression more broadly is well documented, too. Large-scale disaster research has generally found PTSD rates averaging around 20% after major disasters (higher after the most severe events), with depression appearing at meaningfully elevated rates in the same populations. The two conditions frequently reinforce each other — trauma symptoms make it harder to function day to day, and that disruption can deepen depressive symptoms.
PTSD and Other Mental Health Conditions
PTSD can also accompany other behavioral health conditions, including generalized anxiety, bipolar disorder, obsessive-compulsive disorder (OCD), and depression.
PTSD is no longer classified as an anxiety disorder. In the DSM-5 (and its current update, the DSM-5-TR), PTSD moved into its own category: Trauma- and Stressor-Related Disorders. It's still frequently associated with other mood states, including depression, as well as anger and reckless behavior.
Key Points to Remember
Here are a few essentials to keep in mind about how PTSD develops and how it's treated:
If you're experiencing PTSD, it's worth seeking treatment as soon as possible — the sooner symptoms are addressed, the less likely they are to worsen. The same is true if PTSD and depression are occurring together. As with any mental health condition, keeping an open line of communication with loved ones can make a meaningful difference.
There are many factors that can influence whether someone develops PTSD after a traumatic event. To get an accurate diagnosis and the right treatment plan, it's important to work with a trained mental health professional — a psychiatrist or psychologist experienced in trauma-related conditions can help identify what's happening and guide you toward effective care.
