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PTSD is marked by clear biological changes as well as psychological symptoms. PTSD is complicated by the fact that people with PTSD often may develop additional disorders such as depression, substance abuse, problems of memory and cognition, and other problems of physical and mental health.
Post-Traumatic Stress Disorder Symptoms, Causes and Effects. Post-traumatic stress disorder (PTSD) is brought on by witnessing a terrifying, usually life-threatening, event. Severe anxiety, flashbacks, uncontrollable thoughts and nightmares are common symptoms of the illness. These symptoms can worsen and last for years, so it is best to seek treatment for PTSD as soon as possible.