Swiss perspectives in 10 languages

Lunar cycle ‘plays no role’ in mental health

Moon appearing behind a mountain
Theories that the moon affects mental health have abounded since the days of the ancient Egyptians. © Keystone / Anthony Anex

Swiss scientists appear to have debunked a myth that the cycle of the moon can influence our state of mental well-being. A study of thousands of psychiatric patients has found that the moon was in no way to blame for their condition.

Theories linking the lunar cycle to mental health have persisted for thousands of years, dating back to the ancient Egyptian, Assyrian and Babylonian eras. The moon is believed by some to influence the state of mind to such a degree that it can lead to depression and suicidal tendencies.

Researchers at Graubünden Cantonal Hospital, the University Hospital of Zurich and the Albert Einstein College of Medicine in New York decided to put this theory to the test. They compared the medical notes of 17,996 psychiatric patients treated in canton Graubünden between the years 2005-2015 with known lunar cycles in the region.

“The lunar cycles showed no connection with either admission or discharge rates of psychiatric inpatients, nor was there a relationship with the length of stay,” the study, published in the Swiss Medical Weekly, reported.

“Despite the widespread belief that the moon impacts peoples’ mental health and subsequently psychiatric treatment, this study provides no evidence that our celestial neighbour influences our mental well-being.”

News

A view of several prison cell doors in a hallway of the prison in Brenanz in canton Geneva

More

Number of Swiss prisoners rises 7% in one year

This content was published on At the end of January 2024, 6,881 men and women were behind bars in Switzerland. Almost 95% of all places were occupied, the highest number since 2014.

Read more: Number of Swiss prisoners rises 7% in one year

In compliance with the JTI standards

More: SWI swissinfo.ch certified by the Journalism Trust Initiative

You can find an overview of ongoing debates with our journalists here . Please join us!

If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR