Cycles may be 1.6 days longer in people who self-identify as Asian compared with their white non-Hispanic counterparts
Menstrual cycle lengths can vary between people of different ethnicities
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A person’s ethnicity may influence the length of their menstrual cycle.
The menstrual cycle is a series of physiological changes that prepare the body for pregnancy. Part of the cycle is a period, when a person bleeds from the vagina. For most people who menstruate, periods occur around every 28 days; however, this commonly ranges from 21 to 40 days.
To better understand how menstrual cycles can vary, researchers led by a team at the Harvard T.H. Chan School …