Here is a short history on chiropractic, how chiropractors diagnose and treat clients, and a guide that advises therapists when to refer clients to a chiropractor. Daniel Redwood briefly describes the evolution of chiropractic from 2700 B.C. China, to Daniel David Palmer, the founder of chiropractic a century ago, to the state of today's chiropractic profession. Redwood discusses diagnostic procedures and when chiropractors refer to physicians. A checklist is provided for massage therapists that helps to identify when to refer a client to a chiropractor.