Reiki is a Japanese energy healing technique. The predominant form of Reiki practised throughout the world today, also known as Usui Reiki, was created by Dr. Mikao Usui in the early 20th century.
Reiki is a complementary therapy and, according to a review of randomised trials, Reiki may help to reduce pain and anxiety. It may also help to reduce fatigue and bring a calming state of overall well-being to a person.