Does Reiki replace the need for modern medicine?
Reiki is effective in helping virtually every known illness because it works in conjunction with all other medical or therapeutic techniques to relieve side effects and promote recovery, however, It is not a standalone treatment to replace modern medicine or therapies.
There is so much research now into how much Reiki does compliment modern medicine but if you are concerned, then always talk to your doctor first.
While Reiki is not a religion, Mikao Usui, the founder of the Reiki system of natural healing, recommended that one practices certain simple ethical ideals to promote peace and harmony, which are nearly universal across all cultures and beliefs.
How can Reiki work as a complimentary therapy?
Below is the link to Cancer Research UK website where they discuss Reiki as a complimentary therapy:
https://www.cancerresearchuk.org/about-cancer/treatment/complementary-alternative-therapies/individual-therapies/reiki