Women have a daily hormone cycle as well as a monthly one


By Alice Klein

Daily hormone cycles might affect mood and fertility

Female reproductive hormones cycle daily as well as monthly, a small study suggests. The finding may help explain why some women experience daily mood fluctuations.

It is well-established that women’s reproductive hormones like oestrogen, progesterone, follicle stimulating hormone (FSH) and luteinising hormone (LH) follow monthly cycles to help prepare their uteruses for pregnancy.

Steven Lockley at Harvard University and his colleagues wondered if these reproductive hormones might follow daily cycles as well, based on similar findings in mice and rats.

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To find out, they measured hormone levels in 17 women …

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