This is actually a common sign of irritable bowel syndrome, but that is not always the cause.

Frequent bowel movements during periods are common because of hormone level changes. The hormones that signal the release of the lining of the uterus also signal the gastro system; making your bowels move more. This is also why some girls commonly have excessive gas during their period.

Some women have a tilt on their uterus, which presses against their colon, meaning increased pressure within the colon, and they generally have to have more bowel movements.

If you are experiencing extreme pain or other elevated symptoms during your period, consult a doctor. Excessive diarrhea can be a sign of a health problem.