A common belief also links the lunar cycle to women’s menstrual cycles, given that both average around 29 days. Throughout history, this coincidence has inspired symbolic connections between femininity and the moon. Yet, modern science tells a different story. A 2021 study monitoring 529 women over six menstrual cycles found no consistent alignment between menstrual onset and moon phases. The correlation appears to be more cultural and symbolic than biological, though the association continues to shape art, mythology, and collective imagination.
