Given that time to clinical presentation was similar between PTH-M and PTH-NM groups, differences in recovery were unrelated to time from injury.21,22 The finding that personal history of migraine is 10-fold more common in those with PTH-M than PTH-NM, and that headaches at baseline were more common in the PTH-M group, has been described in adult PTH studies and suggests that mTBI may be triggering an underlying risk for migraine in genetically susceptible individuals.23 This evidence concerns the gene PTH and migraine disorder.