A new study added more information to the way we understand how chiropractic adjustments help the brain with pain relief. 13 people with neck stiffness were hooked up to computers that read brainwaves, and were given chiropractic adjustments. When they were adjusted, the machines told them that parts of the brain where pain and suffering occurs has less activity. Adjustments block off pain patterns for pain relief.
This is another study that shows that chiropractic adjustments have more widespread and far-reaching effects on the whole body rather than just in the inflamed part of the spine. Chiropractic adjustments not only relieve back pain, but they also improve dizziness in some patients and other non-spinal problems.
http://www.ncbi.nlm.nih.gov/pubmed/20350670