Questions tagged [menstruation]

Occurs when uterine lining is shed. Cause bleeding and may cause cramps, irritability and other potentially unpleasant effects.

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How does my body know how long a month is?

Every month I get my period. Mine is somewhat irregular, but it's usually between 27-33 days. How does my body gauge that amount of time? Is there some kind of external factor (wake/sleep cycles, ...