PTH and brain injury: Specifically, when compared with those concussion patients who did not experience a new headache in the first week post-concussion, those with acute PTH had significantly higher: (i) number of symptoms and symptom severity scores on the SCAT-3, (ii) psychological disturbances on the Brief Symptom Inventory and (iii) sleep disturbances on the Sleep and Concussion Questionnaire, consistent with previous research on PTH.21–23