Migraine headaches and other types of common headaches, as you would expect, can be caused by many things. Chemical imbalances, environmental factors, and blood-brain circulation issues can all play a role. But muscle tension and spinal dysfunction are the two most common sources of headaches. That’s why it’s so important to correctly diagnose why a headache is occurring in the first place. Misalignments of the spine are one of the biggest causes of tension in the neck, shoulder and back muscles, which, in turn, may cause the onset of a headache. This misalignment can come from bad posture, deterioration of the joints in the neck, impact trauma, and even improper footwear.