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Post-traumatic stress disorder (PTSD) is a mental disorder that develops from experiencing a traumatic event.
Examples include sexual assault, domestic violence, child abuse, warfare along its associated traumas, natural disaster, bereavement, traffic collision, or other traumatic events on a person's life or well-being. Symptoms may include disturbing thoughts, feelings, or dreams related to the events, mental or physical distress to trauma-related cues, attempts to avoid trauma-related cues, alterations in the way a person thinks and feels, and an increase in the fight-or-flight response. These symptoms last for more than a month after the event and can include triggers such as misophonia. Young children are less likely to show distress, but instead may express their memories through play.
Text adapted from Wikipedia, CC BY-SA 4.0.