This project aims to develop and test structural and functional brain imaging biomarkers for improvement in chronic pain from a mind/body intervention perspective in a critical veteran population, namely veterans with post traumatic headache (PTH) associated with mild traumatic brain injury (TBI). The project also aims to examine feasibility in a sample of veterans with PTH of performing resting state and structural neuroimaging protocols, and of obtaining active participation and completion of MBSR training. Lastly, exploratory analysis of brain imaging data will be performed to determine if hypothesized candidate biomarkers are associated with positive outcomes from MBSR and determine estimated effect sizes for future studies in PTH population.