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chiropractic A system of diagnosis and treatment based on the concept that the nervous system coordinates all of the body’s functions and that disease results from a lack of normal nerve function. Chiropractic employs manipulation and adjustment of body structures, such as the spinal column, so that pressure on nerves coming from the spinal cord due to displacement (subluxation) of a vertebral body may be relieved. Practitioners believe that misalignment and nerve pressure can cause problems not only in the local area, but also at some distance from it. Chiropractic treatment appears to be effective for muscle spasms of the back and neck, tension headaches, and certain leg pain. It may or may not be useful for other ailments. Some chiropractors also recommend other forms of treatment, such as massage, diet changes, vitamins and minerals, and herbal supplements. See also chiropractor.