 Patients aged 15 - 30 years diagnosed with concussion at hospitals in Central Denmark Region will be screened for persistent symptoms two months post-injury. Those with impairing symptoms will be invited to participate in a randomised controlled trial comparing the early intervention programme with enhanced usual care. We expect to include 120 patients from 2015-2016. Treatment will be interdisciplinary and will begin approximately 3 - 5 months after concussion. All patients will complete self-report measures at baseline and 3, 6 and 15 months after randomisation. The primary outcome is severity of PCS. 