The 7th cranial nerve travels through a narrow canal that lies beneath the ear. When an unknown condition causes the nerve to swell, it becomes compressed in the narrow canal. This is different than say a bulging disc compressing a nerve in your back. If some folks have gotten relief from going to a chiropractor it is probably because Bells Palsy is self limiting and usually resolves itself, not because of any manipulation that a chiropractor can do in this case. I'm not criticizing chiropractors, I just think that in this case they can't help.
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