The overall objective of this proposal is to better define the relationship between perceived stress, hair cortisol, and migraine in adolescents. Although adolescents most frequently report stress as their migraine trigger, stress measurement and treatment are usually beyond the scope of routine clinical care. Hair cortisol levels may identify stressed adolescents who need structured stress management, as well as provide objective evidence for the medical community, migraineurs (i.e. individuals who experience migraines), and their families, who may be reluctant to accept stress as a migraine factor. The rationale for this research is that scientific validation of an association between stress and migraine will inform future prevention studies in the headache field and potentially identify a stress biomarker for migraine.