Headaches can be due to a wide variety of causes, such as drug reactions, temporomandibular joint dysfunction (TMJ), tightness in the neck muscles, low blood sugar, high blood pressure, stress and fatigue. However, the majority of recurrent headaches are either tension headaches or migraine headaches. Chiropractic care is highly effective at treating headaches by adjusting the cervical spine to correct misalignments and relieve muscle tension.