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A 25-year-old female asked:

I saw my menstruation on the first now am seeing another o the 25th if same month pls is it normal...

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 34 years experience
The math works: A woman with 28-day cycles (or shorter) will occasionally have 2 periods in one month, such as a period beginning February 1 and another beginning February 29. That might happen once a year, because the woman would have about 13 cycles in one year. Because we have only 12 calendar months per year, one of the months must have 2 menstrual periods in order to total 13 periods per year.
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Last updated Feb 25, 2020

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