Given the persistence of continuous headaches in many patients and the clear overlap between symptoms of concussion (i.e., nausea, photo/phonophobia) and symptoms of headache in the acute phase post-injury, it is challenging to accurately characterize individual patients’ headache phenotypes as tension-type or migraine and, as such, we chose to describe the acute PTH characteristics noted rather than try to assign primary headache phenotype labels to individual patients. The gene discussed is PTH; the disease is Headache.