The effects of Reiki on breast cancer patients

Breast cancer and its treatments affect patients’ physical, psychological, and emotional well-being. Practices such as Reiki are used to support symptom management, particularly during chemotherapy. This systematic review aims to evaluate the effects of Reiki practice on improving symptoms in breast cancer patients within the framework of Martha E. Rogers’ “Science of Unitary Human Beings.”

The research was conducted as a systematic review in accordance with the PRISMA 2020 guidelines. A comprehensive literature search was performed in the PubMed, Web of Science, CINAHL (EBSCOhost), Google Scholar, and DergiPark databases, with the search updated through May 2026 prior to the final analysis. Randomized controlled trials, experimental studies, and quasi-experimental studies investigating Reiki interventions in breast cancer patients were included. Methodological quality and risk of bias were independently assessed by two researchers using Joanna Briggs Institute (JBI) critical appraisal tools and the Cochrane Risk of Bias Tool.

Four studies meeting the inclusion criteria included a total of 339 participants. The included studies suggested that Reiki practice may reduce fatigue and improve overall comfort and well-being. Some studies also reported improvements in quality of life, comfort, mental well-being, and mood.

The authors concluded that Reiki appeared to be a safe and well-tolerated complementary intervention in the included studies. Reiki practice may contribute to symptom management, improve quality of life, and support psychological well-being in breast cancer patients. However, due to the limited number of studies, small sample sizes, and methodological differences, larger, well-designed randomized controlled trials are needed.

This is a weird review, if there ever was one!

• It certainly did not follow the PRISMA guidelines.
• It evaluated the effects of Reiki practice on improving symptoms in breast cancer patients; much clearer can one not display a pro-Reiki bias!
• It included non-randomised trials.
• None of the included studies were of sufficiently good quality.

But the weirdest aspect must be the conclusion of the abstract: it aknowledges the fact that the primary studies were rubbish and nevertheless praises the multiple alleged benefits of Reiki. If the evidence is unconvincing due to many flaws of the primary data, the only adequate conclusion should read something like this:

Because of serious flaws of the included studies, the evidence that Reiki affects the symptoms of breast cancer patients fails to be positive.