PTSD (Post-Traumatic Stress Disorder)

Reviewed by Michael Callans, Master’s in Psychology · Last updated June 2026

What is PTSD?

Post-traumatic stress disorder is a mental health condition that some people develop after living through or witnessing a traumatic event. It is natural to feel afraid, on edge, or shaken after danger. For most people those reactions ease over time. When the distress persists, intensifies, or interferes with daily life for more than a month, it may be PTSD.

PTSD is a recognized medical condition with biological and psychological roots, not a character flaw or a failure to "move on." With the right treatment, the brain and body can recover. It is also more common than many people realize. According to the National Institute of Mental Health, an estimated 3.6% of U.S. adults had PTSD in the past year, and about 6.8% experience it at some point in their lives. Rates are roughly twice as high in women as in men.

The current clinical definition comes from the American Psychiatric Association's diagnostic manual, the DSM-5. In broad terms, a diagnosis requires exposure to actual or threatened death, serious injury, or sexual violence, followed by a recognizable pattern of symptoms across four areas that lasts more than a month and causes meaningful distress or impairment. Exposure can be direct, witnessed, learned about happening to a close loved one, or the result of repeated exposure to disturbing details, as some first responders experience. A clinician makes the diagnosis after a careful interview, so the framing here is for understanding, not self-diagnosis.

Symptoms

Symptoms usually begin within three months of a traumatic event, though the U.S. Department of Veterans Affairs and the UK's NHS both note they can sometimes surface months or even years later. They tend to fall into four categories:

• Intrusive memories: unwanted, distressing memories, flashbacks, or nightmares about the event, sometimes with strong physical reactions to reminders.
• Avoidance: staying away from places, people, activities, or conversations that are reminders of the trauma, and trying not to think or talk about it.
• Negative changes in mood and thinking: persistent fear, guilt, or shame, distorted beliefs about oneself or the world, feeling detached from others, loss of interest, or trouble remembering parts of the event.
• Changes in arousal and reactivity: being easily startled, feeling tense or "on guard," irritability or angry outbursts, reckless behavior, difficulty sleeping, or trouble concentrating.

To meet the criteria for PTSD, symptoms last more than a month and cause significant distress or problems in daily functioning. In children, especially young children, the picture can look different. Trauma may show up as bedwetting, re-enacting the event through play, unusual clinginess, or being unable to speak. Some people also experience dissociation, a feeling of being detached from their body or surroundings.

Causes and risk factors

PTSD is triggered by exposure to trauma, but not everyone who experiences trauma develops it. Researchers believe a mix of personal, social, and biological factors shapes the risk:

• Type and severity of trauma: events that are intense, prolonged, repeated, or involve direct threat to life raise the risk. Interpersonal violence and combat are among the most strongly linked.
• Personal history: earlier trauma, childhood adversity, or a history of anxiety or depression.
• Lack of support: limited support from family, friends, or community after the event, or added stress such as injury, loss, or financial strain.
• Biology: the way the brain and stress hormones respond to fear, which can vary from person to person, along with genetic factors.

Some factors appear to be protective, including seeking out support after a traumatic event, learning to feel good about how you responded in the face of danger, and having a coping strategy for getting through and learning from the experience. None of this means PTSD is anyone's fault. It is a normal response to an abnormal event. It also often travels with other conditions: many people with PTSD also live with depression, an anxiety disorder, or problems with alcohol or other substances, sometimes as an attempt to numb the distress. Good treatment takes the whole picture into account rather than treating PTSD in isolation, which is one reason a professional evaluation is so valuable.

How PTSD is treated

PTSD is treatable, and the most effective approaches are well studied. A combination of therapy and, when needed, medication often works best. The right plan depends on the person, so it is worth working with a professional to find what fits.

Trauma-focused psychotherapy

Talk therapies that focus directly on the trauma are considered first-line treatment. The National Center for PTSD highlights three with the strongest evidence. Cognitive processing therapy (CPT) helps you identify and change the unhelpful beliefs that trauma can leave behind. Prolonged exposure (PE) helps you gradually and safely approach trauma-related memories, feelings, and situations you have been avoiding, so they lose their power. Eye movement desensitization and reprocessing (EMDR) helps you process the memory while paying attention to a back-and-forth movement or sound. Trauma-focused cognitive behavioral therapy is also widely used, including with children and teens.

Medication

Certain antidepressants can ease PTSD symptoms and are often used alongside therapy. Selective serotonin reuptake inhibitors (SSRIs) such as sertraline and paroxetine, and the serotonin-norepinephrine reuptake inhibitor (SNRI) venlafaxine, are commonly recommended. Medication should always be started and adjusted by a prescriber, as it can take several weeks to take full effect. Learn more about antidepressants.

Self-care and support

Steady sleep, regular activity, limiting alcohol, and staying connected to people you trust all support recovery. Grounding and breathing techniques can help in moments of distress. These complement, but do not replace, professional treatment.

Which professional to see

For an evaluation and talk therapy, a psychologist, licensed clinical social worker, or licensed counselor trained in trauma is a strong starting point. If medication may help, a psychiatrist or your primary care doctor can prescribe and monitor it. Many people work with both a therapist and a prescriber at once. If symptoms are severe or you are having thoughts of self-harm, seek care urgently rather than waiting for an appointment.

When to seek help

Reach out to a doctor or mental health professional if trauma-related symptoms last more than a month, return after a period of relief, or get in the way of work, relationships, or daily life. Seek help immediately if you have thoughts of harming yourself. Getting help early makes recovery easier, and effective treatment is available.

Frequently asked questions

Related conditions

• AnxietyShared trauma response
• DepressionCommon co-occurring condition
• Grief and BereavementLoss-related distress

Therapists who specialize in ptsd

Connect with a licensed therapist on Psychology.com who works with ptsd.

• A FAMILY MATTERFlorence, Alabama
• Advance Thru Psychotherapy and Family DevelopmentLawrenceville, New Jersey
• Amy KellerPasadena, California
• Anne CiotaLeominster, Massachusetts
• Arlyn P. Stern LCSWSkokie, Illinois
• Asktheinternettherapist.comScottsdale, Arizona

Browse all therapists →

References

• National Institute of Mental Health (NIMH): Post-Traumatic Stress Disorder (PTSD)
• NIMH: PTSD Statistics (past-year and lifetime prevalence)
• U.S. Department of Veterans Affairs, National Center for PTSD: Trauma-Focused Talk Therapies (CPT, PE, EMDR)
• NHS: Post-Traumatic Stress Disorder (PTSD), Symptoms and Treatment
• American Psychological Association: Exposure Therapy