Almost everyone gets a headache now and then. But when headaches show up several times a week, start at the base of your skull, or keep coming back no matter how much water you drink or how many painkillers you take, they are usually telling you something specific. Very often that something involves your neck, jaw, posture or stress load. The challenge is that “headache” isn’t a diagnosis. Tension-type headaches, cervicogenic (neck-related) headaches and migraines feel differ