INTRODUCTION Headache disorders are common among children and adolescents1 and cause substantial disability,2, 3 poor quality of life,4 and impaired school performance.5 Migraine has a prevalence of 8%–10% in children and adolescents6, 7 Persistent post-traumatic headache affects 7.6% of youth with concussion.8 New Daily Persistent Headache, characterized by abrupt onset continuous headache lasting at least months, is uncommon in the general population, with an estimated prevalence of 0.03%,...