Medically reviewed by Shahrzad Shadmani, PMHNP-BC, FNP-C, founder of Integrative Psychiatry and Wellness (IPW Health).
Published September 16, 2026.
Something happened, and you got through it. Weeks or months later, you are still not back to yourself.
Maybe you sleep badly and wake with your heart going. Maybe a sound in a parking lot puts your whole body on alert before you have consciously registered why. Maybe you’ve quietly rearranged your life around places and conversations you no longer go near. Maybe the most confusing part is physical — the jaw that won’t unclench, the stomach that rebels, the fatigue that sleep doesn’t touch — and you’ve been to three appointments about it without anyone asking what you lived through.
That pattern has a name, and it has treatments with real evidence behind them.
What PTSD actually is
Post-traumatic stress disorder is a diagnosis in the American Psychiatric Association’s DSM-5-TR. It can develop after exposure to actual or threatened death, serious injury, or sexual violence — experienced directly, witnessed, learned about happening to someone close to you, or encountered through repeated occupational exposure to the aftermath.
Two things about that definition matter more than most patient-facing writing admits.
First: most people exposed to trauma do not develop PTSD. Distress in the days and weeks after a frightening event is the ordinary response, and for the majority of people it fades. PTSD is the less common outcome, not the expected one.
Second: the diagnosis requires time. Symptoms must persist more than one month and cause meaningful distress or interference with work, relationships, or daily functioning.
Acute stress disorder is not the same thing
If severe symptoms appear in the first month, the diagnosis under consideration is acute stress disorder, which applies from three days to one month after the event. Past one month, if symptoms continue and criteria are met, the diagnosis becomes PTSD.
This isn’t a technicality. It changes what a clinician does. Acute stress disorder often resolves; PTSD can be identified in symptoms that begin later, sometimes months or more after the event, and the treatment plan differs.
The four symptom clusters
DSM-5-TR organizes PTSD symptoms into four groups. Most people don’t have every symptom listed.
Intrusion. Unwanted memories that arrive without being summoned. Distressing dreams. Flashbacks, where some part of you responds as though the event were happening now. Intense distress or physical reactivity when something reminds you of it.
Avoidance. Steering away from the memories, thoughts, or feelings — and from the external reminders: people, places, conversations, activities. Avoidance brings relief in the short term, which is exactly why it tends to expand.
Negative alterations in cognition and mood. Gaps in memory for parts of the event. Persistent beliefs that have hardened — I can’t trust anyone, the world is entirely unsafe, it was my fault. Persistent fear, anger, guilt or shame. Losing interest in things that used to matter. Feeling detached from people. Difficulty feeling positive emotions at all.
Alterations in arousal and reactivity. Irritability or anger with little provocation. Reckless or self-destructive behaviour. Hypervigilance — scanning, checking exits, never quite off duty. An exaggerated startle response. Trouble concentrating. Disrupted sleep.
Why it shows up in your body
Trauma-related symptoms are not only emotional, and the physical side is often what sends people to a clinician first.
Commonly reported physical presentations include chronic muscle tension through the jaw, neck and shoulders; fatigue that rest doesn’t resolve; digestive symptoms without a clear medical explanation; disrupted or non-restorative sleep; a racing heart or a persistent sense of being keyed up; headaches; and physical jumpiness.
Some of this is a direct expression of the arousal cluster above. Some reflects what sustained stress physiology does over time. Research does find group-level differences in stress-response systems and in brain regions involved in threat detection, memory, and regulation — the amygdala, hippocampus, and prefrontal cortex are the ones most often studied.
The practical point stands regardless of mechanism: if you have persistent unexplained physical symptoms and a history of trauma, that history belongs in the conversation with your clinician. It does not replace a medical workup — chest pain, gastrointestinal symptoms and chronic fatigue all need appropriate evaluation — but it should sit alongside one.
How it’s diagnosed
Through clinical interview. A psychiatric or mental health clinician asks about what you experienced, which symptoms are present, how long they’ve lasted, and how much they interfere. Structured questionnaires may be used to track severity over time, but they don’t make the diagnosis on their own.
Clinicians also screen for what commonly accompanies PTSD — depression, anxiety disorders, substance use, sleep disorders — because those change the plan.
What treatment involves
Trauma-focused psychotherapy is the first-line treatment. Major guidelines — including the VA/DoD Clinical Practice Guideline for PTSD and Acute Stress Disorder, the American Psychological Association’s PTSD guideline, and the International Society for Traumatic Stress Studies guidelines — converge on a short list:
- Trauma-focused cognitive behavioural therapy, which addresses both the avoidance and the beliefs that formed around the event.
- Prolonged exposure (PE), a structured, gradual approach to the memories and the avoided situations, at a pace you set with your therapist.
- Cognitive processing therapy (CPT), focused on the “stuck points” — the conclusions drawn about yourself, others and the world.
- EMDR (eye movement desensitization and reprocessing), a structured protocol that pairs brief attention to the memory with bilateral stimulation.
These are delivered by trained therapists over a defined course, not indefinitely. You are not required to narrate everything that happened in detail for any of them.
We cover EMDR — how it works, what the evidence does and doesn’t show, and who it isn’t right for — in a separate article.
Medication. Discussed at the level of class: antidepressants in the SSRI and SNRI classes have the strongest evidence for PTSD and are the medications guidelines recommend when medication is used. Two SSRIs carry FDA approval for PTSD specifically. Medication may be used alongside therapy or when trauma-focused therapy isn’t accessible or tolerable. Guidelines advise against benzodiazepines for PTSD. Sleep and nightmares are sometimes addressed separately. No article can tell you what medication is appropriate for you; that’s an evaluation.
Supportive approaches — sleep, exercise, reduced alcohol, grounding and breathing skills, social connection — reliably help people tolerate treatment and function day to day. They are not substitutes for trauma-focused therapy.
When to seek evaluation
Consider an evaluation if symptoms have lasted more than a month, if your life is shrinking around what you avoid, if sleep has not recovered, if you’re using alcohol or other substances to manage it, or if the physical symptoms have no explanation and won’t settle.
You do not need to be certain you have PTSD to be evaluated. That’s what the evaluation is for.
IPW Health provides psychiatric evaluation and medication management by telehealth in California, Oregon, Washington and Colorado, and in person in Mission Viejo, California. Trauma-focused therapy, including EMDR, is provided in house by our therapy team.
This article is general education, not medical advice, and reading it does not create a patient–provider relationship. Treatment decisions depend on your history and should be made with a clinician who knows it.
If you are in crisis or having thoughts of harming yourself, call or text 988 to reach the Suicide and Crisis Lifeline, available 24 hours a day in the United States. If you are in immediate danger, call 911.
Sources
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR).
- U.S. Department of Veterans Affairs / Department of Defense. Clinical Practice Guideline for the Management of Posttraumatic Stress Disorder and Acute Stress Disorder.
- American Psychological Association. Clinical Practice Guideline for the Treatment of PTSD in Adults.
- International Society for Traumatic Stress Studies. PTSD Prevention and Treatment Guidelines.
- National Institute of Mental Health. Post-Traumatic Stress Disorder.
- National Center for PTSD (U.S. Department of Veterans Affairs). Understanding PTSD and PTSD Treatment.
