Menstrual synchronization between women: myth or reality


Three friends decide to share a flat. After a few months of living together, they realize that all three menstruate at the same time, despite the fact that when they began to live together, their dates did not coincide. It is the consequence of menstrual synchronization.

We tend to believe only what is proven, but many times our own personal experience is stronger and truer than any scientific study. Millions of women throughout history have perceived the aforementioned synchronization, but science has not been able to confirm it.

Studies on menstrual synchronization

  • The first person to study this phenomenon was Martha McClintock, who published her findings in the prestigious journal Nature in 1971. However, McClintock was a psychologist and lacked the knowledge to deal with the subject from a scientific point of view. Despite this, she left an important legacy, since menstrual synchronization is also known as the ‘McClintock effect’.
  • Since then, multiple studies have been carried out, but the truth is that the most rigorous and prolonged in time have not been conclusive, on the contrary, some of those that have been carried out during shorter periods of time, have obtained results.
  • It could be then that the synchronization occurs in a first phase of contact between women, losing this effect over time, despite continuing the coexistence. Or, it could also be that they are just coincidences and the ‘McClintock effect’ does not really exist.


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