Post traumatic stress disorder (PTSD) is an anxiety disorder that can develop after exposure to psychological trauma like natural disasters, accidents, or abuse. Genetic and neurological factors increase risk. Symptoms include emotional numbness, disturbing dreams, irritability, and social withdrawal. Diagnosis involves assessing trauma history and symptoms. Treatment includes pharmacotherapy with antidepressants or benzodiazepines, as well as psychotherapy like exposure therapy or cognitive behavioral therapy. Nursing care focuses on safety, monitoring for suicidal ideation, providing a calm environment, and supporting rehabilitation.