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According to HealthCentral from Remedy Health Media, there are several possible causes for having two periods in one month. A change in birth control methods can contribute to irregular periods, as can intense exercise, ... More »

A normal menstrual cycle is 28 days, but anything plus or minus seven days is considered normal, making it possible to have two periods in one month as little as 21 days apart, according to eMedicineHealth. However, if p... More »

Certain medications, birth control pills and digestive conditions, such as irritable bowel syndrome, can cause two menstrual periods in one month, according to WebMD. Irregular menstrual cycles can also be brought on by ... More »

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A normal menstrual cycle is 28 days, but anything plus or minus seven days is considered normal, making it possible to have two periods in one month as little as 21 days apart, according to eMedicineHealth. However, if p... More »

The most common reason for having two periods in one month is when a woman has a short cycle and one period occurs at the beginning of the month, and then about 24 days later, another occurs at the end of the month, acco... More »

A woman who experiences two periods in one month may be reacting to a medication, have thyroid imbalances such as hypothyroidism or hyperthyroidism, or suffer from uterine polyps or fibroids, according to EmpowHER. Extre... More »

Brown spotting between periods is often a sign of irregular menstrual cycles. It may also be a sign of endometrial or cervical cancer according to WebMD.com. More »