“…Beyond symptom overlap, individuals with migraine and TTH endorse similar attack triggers [23,33,36,57], have elevated rates of psychiatric comorbidities [8,19,37,47], and respond well to EMG biofeedback and other behavioral interventions [17,18,35,39,42]. Merging lines of evidence also suggest indirectly that migraine and TTH may share pathophysiological underpinnings, as evidenced by the prevalence of central sensitization in chronic forms of migraine and TTH [11], efficacy of amitriptyline as a preventive treatment for both conditions [7,18,49,51], and the finding that sumatriptan is most effective for migraine when neck pain (a common feature of TTH) is present [21]. …”