Spinal manipulation dates back to Hippocrates and ancient Egyptian medicine, but the explanation for why it helps has changed more recently than the treatment itself. Patients often describe it the same way: “my spine was out of place, and the manipulation put it back.” Research has disproven that theory. Imaging taken before and after a successful manipulation shows no change in vertebral position at all. The pain relief is real. The reason for it isn’t a bone moving back into place.
What’s Actually Happening
Manipulation remains one of the interventions we use most in our Boulder and Lafayette clinics, for headache, neck, and back pain alike, even as our understanding of why it works keeps evolving. Current research points to a multifactorial response: changes in the central and peripheral nervous system, the circulatory system, and the spinal tissues themselves, rather than a single mechanical fix. The same disconnect between the treatment and the old explanation shows up in the low back and SI joint, where manipulation doesn’t reposition the joint either but still reduces pain.
What the Research Found
Lohman and colleagues published a randomized controlled trial in the Journal of Manual & Manipulative Therapy (2019) that looked at one piece of that response directly. Twenty-eight women with non-specific mechanical neck pain were randomly assigned to receive either cervical spinal manipulation or a sham version of the same treatment. Researchers drew blood before and immediately after.
In the group that received real manipulation, three neuropeptides linked to pain processing in the brain rose significantly: oxytocin, neurotensin, and orexin A. The sham group showed no meaningful change in any of them. Cortisol, a stress hormone, didn’t change significantly in either group, which suggests the effect is specific to pain-related pathways rather than a general stress response.
This is one small study, and it measured a chemical response rather than the actual mechanism connecting that response to pain relief. But it’s a concrete example of the kind of physiological change researchers are now looking at instead of joint alignment.
How We Use This at Mend
The mechanism behind manipulation still isn’t fully mapped out, but the clinical pattern is clear: it reduces pain quickly enough to help a patient move and exercise sooner, and that short-term window is what we use it for. Long-term relief from neck and back pain comes from a progressive strength training program, not repeated manipulation.
If you’re dealing with neck pain and want to know whether manipulation fits your treatment plan, schedule an appointment at our Boulder or Lafayette clinic.
