This page is for general education and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified professional. If this is an emergency, call 911 or 988.
PTSD develops after a person experiences or witnesses a traumatic event — but the event alone does not tell the whole story. Biology, the nature and duration of the trauma, earlier life experiences, and the support available afterward all shape who develops PTSD and who does not. It is not caused by weakness, and many people who go through trauma recover without it.
Key facts
- PTSD can follow many kinds of trauma, not just combat — including assault, abuse, accidents, disasters, and sudden loss (NIMH).
- Most people who experience trauma do not develop PTSD; whether someone does is influenced by several risk and protective factors (VA, National Center for PTSD).
- Risk factors include the severity and duration of the trauma, a history of earlier trauma, and limited support afterward (MedlinePlus).
- Protective factors — such as strong social support and healthy coping — can lower the risk (NIMH).
Events that can lead to PTSD
- Combat and military service
- Physical or sexual assault
- Childhood abuse or neglect
- Serious accidents
- Natural disasters and other life-threatening events
- The sudden or violent loss of a loved one
- Serious or life-threatening illness or medical events
Risk factors
Factors that can raise the likelihood of developing PTSD include:
- More severe, prolonged, or repeated trauma
- A history of earlier trauma or other mental health conditions
- Limited support after the event
- High ongoing stress or additional losses afterward
- Individual differences in biology and the body’s stress-response system
Protective factors
Things that can lower the risk include strong social support, healthy coping skills, and getting help soon after a traumatic event. These are part of why early support and treatment matter.
A note on cause
Understanding contributors helps with treatment and recovery — but no one chooses to develop PTSD, and having it is not a personal failing.
From our clinical review. People often blame themselves — “others went through worse and they’re fine.” But PTSD is not a measure of how bad the event was or how tough you are. It reflects how the nervous system responded, and that is something treatment can address.
To understand what helps, see PTSD treatment options — or take a private, two-minute PTSD self-check.
Frequently asked questions
What causes PTSD?
PTSD develops after experiencing or witnessing a traumatic event — such as combat, assault, abuse, a serious accident, or a disaster. It is not caused by a single factor; biology, the nature of the trauma, prior experiences, and the support available afterward all play a role. It is not a sign of weakness.
Why do some people get PTSD and others do not?
Many people experience trauma and recover without developing PTSD. Risk is influenced by factors like the severity and duration of the trauma, a history of earlier trauma, lack of support afterward, and individual biology. Protective factors, such as strong support and healthy coping, can lower the risk.
Can PTSD develop from events other than combat?
Yes. While combat is one well-known cause, PTSD can follow many kinds of trauma, including sexual or physical assault, childhood abuse, serious accidents, natural disasters, the sudden loss of a loved one, and life-threatening illness.
Sources
- Post-Traumatic Stress Disorder (PTSD) — National Institute of Mental Health (NIMH)
- Post-Traumatic Stress Disorder — MedlinePlus, U.S. National Library of Medicine
- PTSD: National Center for PTSD — U.S. Department of Veterans Affairs (VA)
Reviewed against the sources above. This page is educational and is not medical advice.