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Core Symptoms of Post-Traumatic Stress Disorder

Post-traumatic stress disorder produces four clusters of symptoms that continue for more than one month after exposure to actual or threatened death, serious injury, or sexual violence.

These clusters are intrusion, avoidance, negative changes in cognition and mood, and heightened arousal or reactivity. Diagnosis requires at least one intrusion symptom, one avoidance symptom, two cognition or mood symptoms, and two arousal symptoms, all causing significant distress or impairment in work, relationships, or other areas of life.

Intrusion Symptoms

Intrusion symptoms involve involuntary re-experiencing of the trauma. Common examples include recurrent distressing memories, nightmares, flashbacks in which the person feels as if the event is recurring, and intense psychological or physical distress when reminded of the trauma. Physical reactions can include a racing heart, sweating, or shortness of breath.

Avoidance Symptoms

Avoidance symptoms lead people to steer clear of reminders. Individuals may avoid thoughts, feelings, conversations, people, places, or activities connected to the event. Some also report an inability to recall important aspects of the trauma itself.

Negative Changes in Cognition and Mood

Negative alterations in thoughts and mood often appear or worsen after the trauma. These include persistent negative beliefs about oneself or the world, exaggerated self-blame or blame of others, ongoing negative emotions such as fear, anger, guilt, or shame, loss of interest in previously enjoyed activities, feeling detached from others, and difficulty experiencing positive emotions.

Arousal and Reactivity Symptoms

Arousal symptoms reflect a state of constant alertness. They include trouble falling or staying asleep, irritability or aggressive outbursts, reckless or self-destructive behavior, hypervigilance, exaggerated startle response, and difficulty concentrating.

Symptoms in Children and Adolescents

Young children may show different signs, such as bed-wetting after learning to use the toilet, forgetting how to talk, or becoming unusually clingy. Older children and teens often display irritability, aggression, or a sense of foreshortened future.

Differences by Sex

Women develop PTSD at roughly twice the rate of men. They tend to experience symptoms longer before diagnosis and are more likely to report emotional numbing. Men more often report problems with alcohol or substances after trauma.

When Symptoms Warrant Professional Evaluation

Anyone whose symptoms last beyond one month and interfere with daily functioning should consult a mental health professional experienced in trauma. Early assessment distinguishes PTSD from acute stress disorder or other conditions such as depression or anxiety disorders. Treatment typically combines psychotherapy and, when indicated, medication.

Support from family, friends, or structured groups can reduce risk, while prior trauma exposure, lack of social support, and ongoing life stressors increase vulnerability. Not everyone exposed to trauma develops PTSD; resilience factors such as effective coping strategies and timely help lower the likelihood.

Further details appear in resources from the National Institute of Mental Health, the Office on Women’s Health, Harvard Health Publishing, and the University of Pennsylvania Center for the Treatment and Study of Anxiety.

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