However, this definition was more selective than prior studies of PTH, and criteria from ICHD-3 was included in this definition.5,7 In addition, other PTH studies have found approximately 50% of such headaches meet migraine criteria.18,23 While we found 69% of PTH were PTH-M, the proportion of youth with severe symptoms is likely high in this cohort recruited from specialty concussion clinics. Here, PTH is linked to Headache.