In an effort to determine the prevalence of chronic pain syndromes i.e. headaches in those with mild Traumatic Brain Injury and moderate to severe Traumatic Brain Injury, the Journal of the American Medical Association compiled data from searches executed in databases and articles published between 1951 and February 2008. The search found twenty-three studies including 4206 patients. In twelve of the studies involving civilians as opposed to veterans, they found 1670 patients of which 966 complained of chronic headache (57.8%). The prevalence of chronic pain was greater in patients with mild TBI compared to moderate or severe TBI. The report determined that chronic pain is a common complication in all ranges of TBI.