Reiki is a Japanese form of alternative medicine called energy healing. Reiki practitioners use a technique called palm healing or hands-on healing through which a "universal energy" is said to be transferred through the palms of the practitioner to the patient in order to encourage emotional or physical healing.
According to Christina Pratt in The Encyclopedia of Shamanism, a shaman is a practitioner who has gained mastery of:
Altered states of consciousness, possessing the ability to enter alternated states at will, and controlling themselves while moving in and out of those states.
Mediating between the needs of the spirit world and those of the physical world in a way that can be understood and used by the community.
Serving the needs of the community that cannot be met by practitioners of other disciplines, such as physicians, psychiatrists, priests, and leaders.
A shaman is therefore a specific type of healer who uses an alternate state of consciousness to enter the invisible world, which is made up of all unseen aspects of the world that affect us, including the spiritual, emotional, mental, mythical, archetypal, and dream worlds.
A form of complementary and alternative medicine based on the belief that a vital energy flows through the human body. The goal of energy healing is to balance the energy flow in the patient. It is used to reduce stress and anxiety and promote well-being. Energy healing is being studied in patients receiving cancer therapy, to find out if it can improve quality of life, boost the immune system, or reduce side effects. Also called energy therapy.