American chiropractic, American chiropractic is a natural green therapy. It pays attention to the overall study of the human body, pays attention to the relationship between various organs and tissues in the human body, and seeks a way to maintain and repair the natural physiology and physiological balance. American chiropractic medicine believes that the spine is the second lifeline of the human body, which occupies a central position in the human body and affects human health. According to the guiding ideology and theory of chiropractic therapy in the United States, spinal correction acts on the spine, which is the main connecting part between the brain and other parts of the body. The brain is the main center to control the whole body, and its control must be completed through the spinal nerves (excluding twelve pairs of cranial nerves). When the spine compresses the nerves, the function of the brain can not be effectively exercised, which will cause dysfunction accordingly, thus affecting human health. Many diseases are directly or indirectly related to the compression of spinal nerves.