Chiropractic is a clinical science based on a law of biology that states, "all living things have the ability to live healthy within their environment."

Chiropractic also draws on the theory that the nervous system controls and coordinates all of the human body's functions.

Chiropractic hypothesizes that a relationship exists between the health of the nervous system and the health of the body.

In 1895 the founder of chiropractic, D. D. Palmer, conjectured that a direct relationship exists between the function of the osseous framework of the body and the health of the nervous system and therefore the health of the body.