☆ Y do many girls get cramps on mainly the 1st day of period? ☆

Y do many girls get cramps on mainly the 1st day of period?
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  Answer:

The lining of your uterus builds up during the month, and when you have your period, since you are not pregnant, your body sheds that lining, which is only there for a baby. The week before is usually when this hurts the worst, because your body is getting ready to release it.