Chiropractic is a diverse collection of beliefs and practices occurring under a broad regulatory label. The differences among various chiropractics are so stark that it is difficult to make general statements about chiropractic practice. At one end of the spectrum, however, are so-called “straight” chiropractors who adhere to the original philosophy of D.D. Palmer – that a vital force they call innate intelligence is response for health, and blockages in the flow of this magical force through the nerves are what cause illness. Such chiropractors believe they can influence non-neuromuscular conditions by restoring the flow of innate blocked by mysterious “subluxations” in the spine.
From chiropractors.org we have this definition of “straight” chiropractors:
Because straight chiropractors believe that nearly all diseases are caused by issues with the spine, they don’t believe they need any diagnostic tools. Traditional testing done by medical doctors and hospitals is not even considered by a straight chiropractor as being necessary. Diagnosis is done by finding the subluxations in the spine so that those can be corrected.
This particular version of chiropractic (by some estimates about a third of chiropractors follow this philosophy) is pure pseudoscience. It is, as indicated by the quote above, hostile to science-based medicine. After a century of such belief there isn’t a bit of evidence to support the notion of innate intelligence, chiropractic subluxations, or health benefits from this approach.