Each month, the female body prepares for reproduction by building up a lining in the uterus in preparation for the feeding and protection of a growing baby. If conception does not occur, the body removes this lining and prepares to start all over. This is called menstruation. Besides the hormones that bring on this monthly cycle, there are chemicals in the female body that stimulate the muscles of the uterus to contract in order to remove the lining each month. Women who have high levels of these chemicals experience more intense contractions and more pain. These chemicals have been linked to vomiting, diarrhea, and headaches that can accompany painful periods.
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