Is it Possible for Your Period to Sync Up With Your Best Friends?

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Nicole Kell

Most women have experienced having the same period schedule as their friends. You have probably heard that all the hours you spend together caused your menstrual cycle to sync up. However, there is no scientific evidence based on chemicals or hormones to support this theory. Obstetrician-gynecologist Lynn Simpson explains that proximity cannot change cycle timing or frequency of periods because they simply do not work that way. There is however, a mathematical explanation to why your period might match up with a roommate or close friend. Dr. Simpson explains, “Over time, a woman who has a three-week cycle and another who has a five-week cycle will eventually see their periods coincide and diverge again.” Women who live together for at least a year, are bound to have overlapping cycles a few times. It’s just coincidence of our cycle lengths.

There are other factors that affect menstrual cycles such as birth control pills, stress, chronic illness, and eating disorders. Birth control pills alter the levels of progesterone and estrogen that control and manipulate when a women will have her period, if at all. Stress over life or work caused by constant anxiety and worry can cause a woman’s period to be earlier or later than normal. Living with a chronic illness, having constant health problems and/or taking certain medications can also cause irregular menstrual cycles. Lastly, eating disorders such as anorexia or bulimia or highly restrictive control over caloric intake can impact menstrual cycles.

Even though many women may experience a connection with their close friends or roommates, it seems to be simply a coincidence when their periods happen to sync up.

Do Women’s Periods Really Sync Up When They Spend Time Together?

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