April 5, 2019 by Caitlin Flynn

First, let’s back up a minute to discuss the cause of period cramps. “The endometrium (tissue that lines the uterus) produces chemicals known as prostaglandins,” Kecia Gaither, MD, MPH, FACOG, a board-certified ob-gyn, told POPSUGAR. “These substances cause the uterine muscle to contract and expel the uterine lining each month during menstruation, [which causes] the cramps that women feel.” Additionally, these prostaglandins can cause the stomach upset associated with menses. (Aren’t periods fun?)

Click HERE for the article on Popsugar.