According to the Mayo Clinic, Post-traumatic stress disorder (PTSD) is a mental health condition that's triggered by a terrifying event — either experiencing it or witnessing it. Symptoms may include flashbacks, nightmares and severe anxiety, as well as uncontrollable thoughts about the event.1
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Post-traumatic stress disorder (PTSD) - Symptoms and causes - Mayo Clinic
1 Used with permission of Mayo Foundation for Medical Education and Research, all rights reserved.