Are Periods Affected by the Moon?

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Are Periods Affected by the Moon?

For centuries, people have been fascinated by the moon and its influence on various aspects of our lives. One question that has often been asked is whether the moon can affect menstrual cycles and, consequently, women’s periods. In this blog post, we will explore the scientific evidence and myths surrounding this topic to understand whether there is any truth behind the belief that periods are affected by the moon.

The Lunar Connection

It is no secret that the moon has a profound impact on the Earth. Its gravitational pull influences the tides, animal behavior, and even some aspects of human life. This correlation between the moon and our planet has led some to speculate that women’s menstrual cycles may also be affected.

Belief in the lunar connection is not a recent development. In fact, ancient civilizations such as the Babylonians, Greeks, and Romans observed the moon’s cycles and made connections to menstrual cycles. They believed that menstrual cycles were tied to the moon’s phases, with menstruation occurring during the new or full moon.

However, it’s essential to distinguish between ancient beliefs and scientific evidence. To determine whether periods are affected by the moon, we need to examine modern studies and research.

Scientific Studies

Several scientific studies have been conducted to investigate the relationship between the lunar cycle and menstruation. One notable study published in the American Journal of Obstetrics and Gynecology in 1980 observed 826 women over five years. The researchers found no significant correlation between the lunar phases and the onset of menstruation.

Another study published in 2006 in the Swiss Medical Weekly examined nearly 7,000 menstrual cycles. The researchers concluded that there was no evidence supporting a lunar effect on period onset, duration, or menstrual blood loss.

In a more recent study published in 2013 in the International Journal of Gynecology and Obstetrics, researchers analyzed data from over 34,000 menstrual cycles. Once again, no significant relationship between menstrual cycles and lunar phases was found.

These studies, along with many others, consistently indicate that there is no scientific basis for the belief that periods are influenced by the moon.

Menstrual Cycles and the Moon’s Length

Some proponents of the lunar effect argue that menstrual cycles align with the moon’s 29.5-day cycle. This claim suggests that women’s periods naturally follow the moon’s phases.

While it is true that the average menstrual cycle is around 28 to 30 days, the length of individual cycles varies significantly from person to person. Menstrual cycles depend on various factors, including hormonal changes, stress levels, medication, and reproductive health. Therefore, any similarities between menstrual cycles and the lunar cycle are mere coincidences rather than an actual causative relationship.

The Influence of Beliefs and Cultural Factors

Although scientific research debunks the notion of the moon’s effect on menstrual cycles, it is worth acknowledging that cultural beliefs and personal perceptions can contribute to the idea that periods are linked to the moon.

Beliefs and folklore handed down through generations can shape our perception of reality, despite contradictory scientific evidence. Additionally, social and cultural narratives often reinforce these beliefs, perpetuating the idea that periods are influenced by the moon.


While the moon undeniably holds sway over many aspects of our planet, there is no scientific evidence to support the claim that it affects menstrual cycles. Numerous studies have concluded that there is no correlation between the lunar phases and the onset, duration, or flow of periods. Similarities between the length of the lunar cycle and individual menstrual cycles are purely coincidental.

However, it is essential to recognize and respect cultural beliefs. The idea that periods are influenced by the moon has persisted throughout history and continues to be an integral part of certain cultures. Understanding these beliefs and providing accurate information can help dispel myths and encourage an evidence-based understanding of menstruation.

So, the next time someone asks if periods are affected by the moon, you can confidently answer: not according to science.

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Are Periods Affected by the Moon?