Post-traumatic stress disorder (PTSD) is a condition that can develop after experiencing or witnessing a traumatic event. Symptoms include reliving the event through flashbacks or nightmares, avoiding reminders of the trauma, feeling constantly on edge, and feeling detached or estranged. PTSD is diagnosed when symptoms last more than a month and cause significant distress or impairment. Treatment focuses on helping patients process the trauma through exposure therapies and medications to reduce anxiety and depression. Nursing priorities involve ensuring safety, building self-esteem, and teaching healthy coping strategies.