Participants must also report on the Clinician Administered PTSD Scale (CAPS-5) an exposure to a traumatic event (Criterion A), at least one intrusion symptom (Criterion B), and at least one avoidance symptom (Criterion C). There is some evidence suggesting 40% comorbidity between PTSD and new onset headache, so it is reasonable to assume that at least half of all PTHA participants recruited for this study will have PTHA and comorbid PTS symptoms. The inclusion of PTS symptoms in this sample is vital based on reports indicating that PTS symptoms and PTSD actually increase vulnerability to PTHA and chronic headache in military populations [clinicaltrials_resource:edb1437e90e6227ad2381730763ca061]

Participants must also report on the Clinician Administered PTSD Scale (CAPS-5) an exposure to a traumatic event (Criterion A), at least one intrusion symptom (Criterion B), and at least one avoidance symptom (Criterion C). There is some evidence suggesting 40% comorbidity between PTSD and new onset headache, so it is reasonable to assume that at least half of all PTHA participants recruited for this study will have PTHA and comorbid PTS symptoms. The inclusion of PTS symptoms in this sample is vital based on reports indicating that PTS symptoms and PTSD actually increase vulnerability to PTHA and chronic headache in military populations [clinicaltrials_resource:edb1437e90e6227ad2381730763ca061]