The study is run in an outpatient setting at the Department of Physical Medicine and Rehabilitation, St. Olavs Hospital, Trondheim University Hospital, Norway. All patients are also participants in the observational study: Minimal and mild head injury: an exercise and outpatient follow-up study at St. Olavs Hospital (REK number 2018/2159).
The investigators aim to evaluate effects of an outpatient rehabilitation program based on Acceptance and Commitment Therapy compared to usual care on function in patients with post-concussion syndrome (PCS) and post-traumatic headache (PTH). This study builds on the investigators' previous observational studies and treatment studies in this patient group.