DISORDER GUIDES · GUIDE 06
Post-traumatic stress disorder
Post-traumatic stress disorder can develop after experiencing or witnessing a traumatic event — violence, combat, a serious accident, disaster, or assault. The nervous system stays on guard long after the danger has passed: memories intrude, the body startles, and life quietly reorganizes around avoidance. It is an injury of memory and alarm, not a failure of toughness.
These guides describe patterns clinicians look for — not a diagnosis of any reader. A label is a map, not the person: two people with the same diagnosis can look very different, and only a clinician who knows your history can say what a pattern means. If you recognize yourself in one of these guides, treat that as a reason to start a conversation with a professional, not as a conclusion.
EVIDENCE REVIEW
OCTOBER 18, 2026
Common signs
- Intrusive memories, nightmares, or flashbacks in which the event feels present again
- Avoidance of reminders — places, people, conversations, feelings
- Negative shifts in mood and thinking: numbing, guilt, shame, detachment from others
- Hyperarousal: startle, vigilance, irritability, poor sleep and concentration
- Symptoms lasting more than a month and interfering with daily life
- Often travels with depression, anxiety, or increased alcohol or substance use
How it's diagnosed
A clinician establishes the link between the trauma and the symptom pattern — intrusion, avoidance, negative mood and thinking changes, and hyperarousal persisting beyond a month. Shorter reactions in the first month (acute stress) are common and often resolve; PTSD is diagnosed when the pattern endures. Screening instruments like the PCL-5 can support assessment, and medical and substance-related contributors are reviewed.
How it's treated
Trauma-focused psychotherapies have the strongest evidence: cognitive processing therapy, prolonged exposure, and EMDR help the memory become a memory — something that happened, rather than something still happening. SSRI and SNRI medications are evidence-based options (see the medication guides). Treatment works: many people improve markedly, and earlier treatment is usually easier than later.
When to seek help promptly
Seek urgent help if trauma symptoms come with suicidal thoughts, escalating substance use, or an inability to function or stay safe. In the US, call or text 988 any time; veterans can press 1 for the Veterans Crisis Line. And if nightmares, startle, and avoidance are running your life, that alone is reason enough to start treatment — you do not have to wait for a crisis.
