PTSD, or post-traumatic stress disorder, is a mental health condition that can develop after experiencing or witnessing a traumatic event such as combat, natural disasters, accidents, or violence. Symptoms of PTSD may include flashbacks, nightmares, severe anxiety, and uncontrollable thoughts about the event. Treatment for PTSD usually involves therapy, medication, or a combination of both to help individuals recover and manage their symptoms. PTSD research focuses on understanding the causes, symptoms, risk factors, and effective treatments for the disorder.