Post-traumatic stress disorder (PTSD) is a mental health condition that is triggered by experiencing or witnessing a traumatic event. Symptoms can include flashbacks, nightmares, severe anxiety, and uncontrollable thoughts about the event. Research in this area focuses on understanding the causes, risk factors, and treatment options for PTSD, as well as ways to prevent and manage symptoms. This research often involves studying the brain's response to trauma, developing therapies such as cognitive behavioral therapy and eye movement desensitization and reprocessing (EMDR), and exploring the impact of trauma on physical health.