According to The National Center for Complementary and Integrative Healthcare (NCCIH) complementary, alternative and integrative practices are "...healthcare approaches that are not typically part of conventional healthcare or that may have origins outside of usual Western practice."
Practitioners of traditional healing approaches such as Reiki often have highly developed sensitivity that allows them to detect subtle variances in the clients' field.
As the practitioner works in these areas, the clients tend to relax. Once relaxed, body and mind work together to support the healing process.*