Are Women’s Cycles Connected to the Moon?

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Are Women’s Cycles Connected to the Moon?

There has long been a belief that women’s menstrual cycles are connected to the phases of the moon. This theory suggests that women’s bodies naturally synchronize with the lunar cycle, causing their cycles to occur at the same time as the moon’s various phases. In this blog post, we will explore the science behind this phenomenon and whether there is any truth to this popular belief.

History and Folklore

The idea of women’s menstrual cycles being linked to the moon can be traced back thousands of years. Many ancient cultures, such as the Babylonians, Greeks, and Mayans, believed in a connection between women’s fertility and the lunar cycle. In fact, the word “menstruation” itself comes from the Latin word “menses,” which means “month” and is derived from the word “moon.”

Folklore often connected women’s cycles to the moon due to the similar length of both. The lunar cycle, which consists of approximately 29.5 days, is often compared to the average menstrual cycle, which lasts around 28 days. This similarity in duration led to the belief that women’s bodies and the moon were intricately connected.

The Possible Science Behind the Connection

While the belief in the connection between women’s cycles and the moon is steeped in history and folklore, is there any scientific evidence to support this idea? Researchers have attempted to investigate this phenomenon, but the results have been inconclusive.

One study conducted in 1980 by Dr. Winnifred Cutler suggested that some women’s cycles may be influenced by the moon. Dr. Cutler observed that out of the 312 women she studied, around 40% had menstrual cycles that aligned somewhat with the lunar cycle. These women tended to ovulate during the full moon and menstruate during the new moon.

However, other studies have failed to replicate these findings, and the overall scientific consensus is that there is no significant link between women’s menstrual cycles and the moon. Most menstrual cycles are regulated by hormonal changes within the body, primarily the rise and fall of estrogen and progesterone.

Menstrual Cycle and Lunar Phase Chart

A common tool used to explore the correlation between women’s cycles and the moon is a menstrual cycle and lunar phase chart. This chart allows individuals to track their cycles alongside the moon’s phases to determine if there is any connection. Below is a simple example of such a chart:

Menstrual Cycle Day Lunar Phase
1 New Moon
14 Full Moon
28 New Moon

While filling out a menstrual cycle and lunar phase chart can be an interesting exercise, it is essential to note that any correlation observed is likely due to chance rather than any inherent connection between the two.

The Influence of Moonlight and the Circadian Rhythm

Although there is no scientific evidence to support the idea of a direct connection between women’s cycles and the moon, some researchers have explored the potential influence of moonlight on the human body.

It has been suggested that exposure to natural light, including moonlight, can affect our circadian rhythm—the 24-hour internal clock that regulates various bodily functions. The circadian rhythm plays a role in regulating sleep-wake cycles, hormone production, and overall physiological processes.

It is possible that changes in moonlight exposure during different lunar phases could indirectly influence hormonal levels, including those involved in the menstrual cycle. However, this hypothesis is still speculative and requires further scientific investigation to establish a concrete link.


While the idea of women’s cycles being connected to the moon holds a certain allure and has been ingrained in various cultures for centuries, there is little scientific evidence to support this belief. The majority of research suggests that women’s cycles are primarily regulated by hormonal changes within their own bodies, rather than any external lunar influence.

However, the subject remains intriguing, and further research may shed more light on the complexity of the human body and its relationship with the natural world. Until then, women can continue to track their cycles alongside the moon’s phases for personal interest or as a way to connect with ancient traditions and folklore.

Ultimately, whether or not women’s cycles are connected to the moon, the menstrual cycle is a natural and essential part of a woman’s reproductive health. Understanding and embracing this natural process is crucial for overall well-being and self-care.

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Are Women’s Cycles Connected to the Moon?