It's true that almost everyone has suffered from a headache or migraine, whether the pain is sharp, dull, behind the eyes, all over, lasting a couple hours, or even a couple days. Most commonly, they are caused by tension. Tension headaches are affecting about 75% of American and described as a constant band-like pain, tightness, or pressure around the forehead or back of the head and neck. Every client's case can be different, but a Chiropractic adjustment and manipulation of the upper two cervical vertebrae can be extremely helpful.