“…35 ON is frequently associated with head trauma and whiplash injuries. 15,19,40 In one study evaluating service members evacuated from Operations Iraqi and Enduring Freedom with headaches, 4.9% were given a primary diagnosis of ON. 15 However, these statistics may belie the socioeconomic burden of conditions that may respond to interventions targeting the occipital nerve(s), as approximately 50% of migraineurs, 2,5,6,11,23,48 a majority of individuals with cluster headache, 2,4,23,37,45 and significant proportions of individuals with tension-type, 8,48 posttraumatic, 29,48 and cervicogenic headaches 8,23,29 also respond to occipital nerve block.…”