In this study, researchers used ultrasonography to measure activity in the deep neck muscles of 22 cervicogenic headache patients and 22 healthy subjects. They observed that the deep neck muscles in the healthy subject group were thicker than those of participants in the cervicogenic headache group. The findings suggest that atrophy of deep neck muscles may play a role in cervicogenic headaches, and clinicians should keep this in mind when developing a treatment plan for patients with this condition. Doctors of chiropractic commonly treat patients with cervicogenic headaches using spinal manipulative therapy and therapeutic exercise. Cranio, October 2019