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How many days is the menstrual cycle normal?

Female  28 years old 2018-06-04
My girlfriend's menstrual cycle is not very accurate, sometimes the cycle is long, sometimes the cycle is short, how many days is the menstrual cycle normal?

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  • BY Ina Barton 2018-06-04
    The period is not fixed. In fact, there are not many cycles that happen to be 30 days. The normal cycle is between 20 and 36 days, and a regular pattern is sufficient. If the cycle is always 40 days, but there is no physiological and reproductive function, it is still a normal menstrual cycle. Periodic changes in menstruation are a reflection of periodic changes in the ovaries.
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