Post-traumatic stress disorder (PTSD) is a psychological reaction that occurs after experiencing a traumatic or stressful event such as combat, violence, accidents, or natural disasters. It is characterized by symptoms like reliving the event through flashbacks or nightmares, avoiding reminders of the trauma, and feeling constantly on edge or distressed. Children may exhibit PTSD through stomach aches, headaches, or refusal to socialize. Treatment involves therapy, medication, or both and aims to help patients manage distressing thoughts and feelings about the trauma to reduce symptoms over 6-12 weeks. Family therapy programs bring relatives together to strengthen relationships and support the person with PTSD.