http://medicalxpress.com/ en-us Medical Xpress internet news portal provides the latest news on Health and Medicine. (Medical Xpress)—The onset of Post-Traumatic Stress Disorder (PTSD) is unpredictable. Because it depends on the unforeseeable occurrence of traumatic events, it is difficult to identify preventative or causative factors. Scientists typically turn to patients who have already developed PTSD to study the disorder, but that means they can't draw comparisons to their psychological state prior to experiencing trauma. http://medicalxpress.com/news/2013-02-gene-high-anxiety-effect-battlefield.html Psychology & Psychiatry Wed, 13 Feb 2013 16:50:01 EST news279994850 It's not how much violence a child is exposed to that can create emotional and behavioral problems in life. It's exposure to a variety of different types of violence. http://medicalxpress.com/news/2013-02-impact-violence-children.html Health Wed, 13 Feb 2013 08:30:03 EST news279965307