Nearly 20 percent of military service members who have returned from Iraq and Afghanistan -- 300,000 in all -- report symptoms of post traumatic stress disorder or major depression, yet only slight more than half have sought treatment, according to a new RAND Corporation study.

A traumatic event is much more likely to result in posttraumatic stress disorder (PTSD) in adults who experienced trauma in childhood – but certain gene variations raise the risk considerably if the childhood trauma involved physical or sexual abuse, scientists have found.

Thousands of World Trade Center rescue and recovery workers were still suffering serious mental health effects three years after the disaster, the Health Department reported today. New findings released from the World Trade Center Health Registry show that one in eight rescue and recovery workers (12.4%) likely had post-traumatic stress disorder when they were interviewed in 2003 and 2004.

Controversy continues to swirl concerning the findings of a landmark study that estimated the percentage of Vietnam veterans suffering from post traumatic stress disorder (PTSD).

Depression may be an unrecognized readjustment problem for recently returning veterans of the conflicts in Iraq and Afghanistan, according to a study released today at the American Psychological Association 115th Annual Convention.

Prolonged periods of deployment among Britain’s armed forces is associated with mental health problems, finds a study published on bmj.com today.

A survey of adults displaced by war in northern Uganda found high rates of post traumatic stress disorder (PTSD) and depression, and that these individuals were more likely to favor violent means to end the conflict compared to persons without these symptoms, according to a study in the August 1 issue of JAMA, a theme issue on violence and human rights.

Researchers from MIT's Picower Institute for Learning and Memory have uncovered a molecular mechanism that governs the formation of fears stemming from traumatic events.

For sufferers of Post Traumatic Stress Disorder (PTSD), sleep disturbances are among the most treatment-resistant symptoms and can lead to drug and alcohol abuse and even suicide. Previously, there has been little success in treating these sleep disorders with psychopharmacologic approaches.