A natural method of health care that is based upon the understanding that good health depends, in part, upon a normally functioning nervous system (especially the spine, and the nerves extending from the spine to all parts of the body). Doctors of Chiropractic (DC) are physicians who assess the total health of their patients and use non-surgical, drug-free treatment methods that include manipulating the spinal column. DC's are licensed professionals with 4 years of post-graduate doctoral education.