Chiropractic occupies an unusual space: it originated from ideas that have no scientific basis, yet some of its core techniques have gained enough clinical evidence to earn a place in mainstream medical guidelines. Whether chiropractic qualifies as a science depends on which version of chiropractic you’re asking about, because the profession itself is deeply divided on that question.
The Unscientific Origins
Chiropractic was founded in 1895 by D.D. Palmer, who worked as a “magnetic healer” and drew heavily from the occult practices and folk medicine of his era. Palmer believed he could correct what he called a fifth force in the body, something he termed “Innate Intelligence,” which he saw as the explanation for the presence or absence of health. This concept has no basis in any known branch of physics or biology, and it remains untestable by any scientific method.
A detailed historical analysis published through the National Library of Medicine traced Innate Intelligence directly to practices like animal magnetism and radionics. The paper concluded that the concept “remains an untestable enigma that isolates chiropractic and impedes its acceptance as a legitimate health science.” It also noted that the idea carries “a high penalty in divisiveness and lack of logical coherence” within the profession itself.
The Subluxation Problem
Central to traditional chiropractic theory is the idea that tiny misalignments of the spine, called “vertebral subluxations,” cause disease by disrupting nerve flow. This is the concept that many chiropractors still use to justify treating everything from allergies to digestive problems. The trouble is that no one has been able to reliably detect these subluxations with imaging or any other diagnostic tool, and no clinical trials have confirmed that correcting them produces the broad health effects that traditional chiropractors claim.
A 2025 narrative review in the journal Cureus looking at upper cervical subluxation and dizziness found zero experimental studies, no clinical trials, and no basic science research to support the concept. The authors themselves acknowledged that their findings were “susceptible to bias and placebo effects” and called for randomized controlled trials that don’t yet exist. The Bárány Society, the international authority on balance disorders, has stated that the data supporting cervical mechanisms in humans “are inconclusive” and that the terminology used by chiropractors implies a mechanistic understanding “that is currently lacking.”
Where the Evidence Actually Exists
Strip away the subluxation theory and what remains is spinal manipulation, a physical technique that does have a real, if modest, evidence base for certain conditions. Systematic reviews published in JAMA have found that spinal manipulative therapy is associated with statistically significant benefits for acute low back pain when compared to sham treatments or no treatment at all. However, those same reviews found it performed no better than other effective treatments like physical therapy or anti-inflammatory medication. One review put it bluntly: “the efficacy of manipulation for patients with acute or chronic low back pain remains unconvincing.”
Despite those mixed findings, the American College of Physicians included spinal manipulation in its clinical practice guidelines as a nonpharmacologic option for acute, subacute, and chronic low back pain. The recommendation is strong, but the evidence quality for spinal manipulation specifically is rated as low. It sits alongside massage, acupuncture, yoga, tai chi, and cognitive behavioral therapy as options to try before turning to medication. In other words, mainstream medicine views spinal manipulation as one tool among many for back pain, not as a primary treatment and not as a cure for systemic disease.
Claims Beyond Back Pain
Many chiropractors market their services for conditions far outside the musculoskeletal system: asthma, colic, ear infections, digestive problems. The evidence here is thin to nonexistent. A randomized controlled trial of chiropractic care for infantile colic, published in a peer-reviewed journal, enrolled 200 children and found that babies receiving chiropractic treatment cried about half an hour less per day than those in the control group. That sounds promising until you look closer: when the researchers adjusted for baseline differences in crying, the result lost statistical significance. Sleep, contentedness, gastrointestinal symptoms, and colic status showed no meaningful difference between the groups. The number needed to treat was 6.5, meaning roughly seven babies would need to receive chiropractic care for one to gain an extra hour of reduced crying.
This is the pattern across non-musculoskeletal claims. The studies that exist tend to be small, poorly controlled, or show effects that vanish under closer statistical scrutiny. No major medical guideline recommends chiropractic care for asthma, colic, ear infections, or any condition outside the musculoskeletal system.
What Researchers Think Is Actually Happening
Scientists who study spinal manipulation have proposed several biological mechanisms that could explain its effects on pain, none of which involve Innate Intelligence or subluxations. When a chiropractor performs an adjustment, the physical stretching of spinal muscles stimulates growth factors and activates sensory receptors in the joints and surrounding tissue. This barrage of sensory input may temporarily change how the spinal cord and brain process pain signals.
A 2025 randomized controlled trial published in PLOS One found that 12 weeks of chiropractic adjustments increased levels of a protein involved in brain plasticity (the brain’s ability to reorganize its neural connections) compared to a control group. The same study observed changes in cortisol levels, suggesting the adjustments may influence the body’s stress response system. Earlier research has shown that spinal manipulation can alter brain activity in areas related to sensory processing, motor control, and decision-making, and can temporarily improve muscle force production. These are real, measurable neurological effects, but they’re the kind of modest, short-term changes you’d expect from any skilled manual therapy. They don’t validate the sweeping claims of traditional chiropractic philosophy.
A Profession Split in Two
The chiropractic profession is not a monolith. On one side are “straight” chiropractors who adhere to the original subluxation-based philosophy and may claim to treat a wide range of diseases through spinal adjustment alone. On the other side are “mixer” or evidence-based chiropractors who limit their practice to musculoskeletal complaints, use spinal manipulation alongside exercise prescription and rehabilitation, and reject the subluxation model. These two camps have been in open conflict for decades.
The World Health Organization recognizes chiropractic as a health care profession and has published guidelines setting minimum training requirements: at least 4,200 hours of instruction over four years for those without prior health care education, including 1,000 hours of supervised clinical training. The WHO defines chiropractic as concerned with “the diagnosis, treatment and prevention of disorders of the neuromusculoskeletal system,” which is a notably narrower scope than what many traditional chiropractors claim to practice.
Safety Considerations
Spinal manipulation of the lower back carries relatively low risk. Neck manipulation is a different story. An estimated 1 in 20,000 cervical manipulations results in a vertebral artery dissection, a tear in one of the arteries supplying the brain, which can lead to stroke. The exact incidence is uncertain because many cases likely go unreported, and some researchers argue the true risk may be higher. For a healthy person with low back pain, this risk is essentially irrelevant since the treatment wouldn’t involve the neck. But for anyone receiving high-velocity neck adjustments, particularly repeatedly over time, it’s a risk worth understanding.
So, Is It a Science?
Chiropractic as a philosophy, built on Innate Intelligence and the subluxation theory, does not meet the basic criteria of a science. Its core claims are untestable, unsupported by experimental evidence, and rooted in 19th-century vitalism rather than biology. Spinal manipulation as a technique, however, has a limited but real evidence base for musculoskeletal pain, plausible neurological mechanisms, and a place in evidence-based clinical guidelines. The honest answer is that chiropractic contains a scientifically supportable practice wrapped inside a scientifically unsupportable belief system, and which one you encounter depends entirely on which chiropractor you walk into.