Chiropractic is to the non-surgical treatment of the nervous system, specifically with focusing on spinal manipulation and treatment of surrounding areas. Many studies have concluded that therapies commonly conducted by chiropractors can be effective for the treatment of lower back pain. 

The term "subluxation" is used by doctors of chiropractic to depict the altered position of the vertebra and subsequent functional loss, which determines the location for the spinal manipulation. "Subluxation" has been defined medically as "...a partial abnormal separation of the articular surfaces of a joint."1

Chiropractors have described the term to include a complex of functions (i.e., the subluxation complex) as "…an alteration of the biomechanical and physiological dynamics of contiguous structures which can cause neural disturbances."