A reasonable question to ask is how can one disorder cause all of these problems? The answer lies in understanding the function of the sympathetic nervous system, which is part of the autonomic nervous system. As noted above, the sympathetic part of the autonomic nervous system is the part that keeps the body "on alert." For instance, during an athletic event, your heart rate, blood pressure, and breathing rate are dramatically increased so you can perform optimally. The blood vessels shift blood away from the intestines into the muscles, enabling you to compete at a high level.

The posterior cervical sympathetic system signals the sympathetic part of the autonomic nervous system that controls the head, neck, and face area. In the Barre-Lieou Syndrome, the posterior cervical sympathetic system is underactive and the parasympathetic nervous system is too active.
This explains why a person gets migraine headaches and cluster headaches. Remember all of those symptoms associated with the cluster headache, including eye tearing, redness in the eyes, and nasal stuffiness? What about migraine headaches being caused by too much vasodilation of the cranial blood vessels? This, again, is from too much parasympathetic nervous system activity and too little sympathetic. Find the cause of why this occurs and correct it, and the possibility of curing chronic headaches is excellent.

As it turns out, the posterior sympathetic ganglion are located in the front of the neck just in front of the vertebrae. They are the superior sympathetic, middle sympathetic, and stellate ganglia. Any type of vertebral instability or subluxation can effect the function of the ganglia. This is exactly what happens.

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