Of the 127 subjects involved in the controlled study, 22 percent of those receiving chiropractic spinal treatment reported a greater than 90 percent reduction in migraines after just 2 months of care. Approximately 50 percent more reported significant improvement in severity of migraine episodes.  This is not the first study supporting the benefits of chiropractic care in the treatment of headaches.  An impressive number of previous scientific studies have found chiropractic care safe and effective in the management of many of the most common headache types.