But shortly after a visit to a chiropractor, she had suffered a vertebral artery dissection, a form of stroke. Chiropractic neck adjustments are not a common cause of stroke (maybe one in every twenty thousand treatments produces one), but the high rotary force involved, one with just the right vector and amplitude, can strip off the inner layer of a blood vessel, causing it to tear and collapse into the channel, impeding the flow of arterial blood to the brain.
