Post-Traumatic Stress Disorder (PTSD)

Post-traumatic stress disorder (PTSD) is a psychiatric disorder that may occur in people who have experienced or witnessed a traumatic event such as a natural disaster, a serious accident, a terrorist act, war/combat, or rape or who have been threatened with death, sexual violence or serious injury.


Intrusive memories

  • Recurrent, unwanted, distressing memories of the traumatic event
  • Reliving the traumatic event as if it were happening again (flashbacks)
  • Upsetting dreams or nightmares about the traumatic event
  • Severe emotional distress or physical reactions to something that reminds you of the traumatic event


  • Trying to avoid thinking or talking about the traumatic event
  • Avoiding places, activities or people that remind you of the traumatic event

Negative changes in thinking and mood

  • Negative thoughts about yourself, other people or the world
  • Hopelessness about the future
  • Memory problems, including not remembering important aspects of the traumatic event
  • Difficulty maintaining close relationships
  • Feeling detached from family and friends
  • Lack of interest in activities you once enjoyed
  • Difficulty experiencing positive emotions
  • Feeling emotionally numb

Changes in physical and emotional reactions

  • Being easily startles or frightened
  • Always being on guard for danger
  • Self-destructive behavior, such as drinking too much or drinking too fast
  • Trouble sleeping
  • Trouble concentrating
  • Irritability, angry outbursts or aggressive behavior
  • Overwhelming guilt or shame

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Eligible participants may receive study-related care at no cost and may receive financial compensation for time and trial-related travel expenses. Enrollment is limited.

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