Objectives: This study evaluated the prevalence and characteristics of posttraumatic headaches attributed to Mild brain injury in military personnel in Isfahan.Methods: A prospective, observational, descriptive study was conducted with a cohort of military personnel in military training during a 6-month period at the Military Training Center in Isfahan, Iran. A total of 322 military personnel were selected randomly and given a 13-item Mild brain injury questionnaire and headache questionnaire, and reevaluated after a 3-month period.Results: A total of 30 (9.3%) of the 322 military personnel met the criteria for a Mild brain injury. Among them, 18 personnel (60%) reported headaches during the 3-month re-evaluation. PTHs were defined as headaches beginning within 1-week after a head trauma and were present in 5.6% of military personnel during the 6-month study period; 67% of PTHs were classified as migrainous or having possible migrainous features. Patients with disorders such as PTSD and depression were at a higher risk for developing PTH following Mild brain injury (p<0.05). PTH did not relate to demographic factors such as age or type of trauma.Conclusions: PTH attributed to Mild brain injury is a common disorder in military personnel. Migrainous features are predominant among them when compared to the general population. PTH is not related to a particular type of trauma, but is associated with affective disorders.