 Due to recent wars in Afghanistan and Iraq, the number of Veteran suffering from Mild traumatic brainMTBI injury and PTSD increases rapidly. Headache is one of the most debilitating clinical symptoms in Veteran with MTBI and the cause of it is still not entirely clear. Recently, the use of non-invasive brain stimulation such as repetitive transcranial magnetic stimulationrTMS has yielded favorable clinical outcome in a few intractable chronic central pain conditions including headaches. This study aims to 1 assess the effect of rTMS in relieving headache and improving neurophysiological functions; and 2explore the neuronal mechanisms associated with MTBI related headache and the analgesic effect of rTMS with function magnetic resonance imaging fMRI. 