WEDNESDAY, Jan. 30 (HealthDay News) -- Researchers report that soldiers who have suffered concussions during their time in Iraq are more likely to experience post-traumatic stress disorder and other physical health problems.

"There was indeed a higher rate of PTSD and/or health problems among those who had concussions versus those with other injuries," said study author Dr. Christopher Hoge, director of psychiatry and neuroscience at Walter Reed Army Institute of Research, in Washington, D.C. His study is published in the Jan. 31 issue of the New England Journal of Medicine.

Head and neck injuries have been reported in one quarter of troops evacuated from these areas. The proportion of soldiers with concussion may be as high as 18 percent.

Visit the government's National Center for PTSD for more on this condition.