The credit (blame?) lies with fluctuations in one specific hormone.

Add Yahoo as a preferred source to see more of our stories on Google. Dads shouldn't shy away from conversations about their daughters' reproductive health—even if conversations about menstruation are ...

What Is the Luteal Phase? The luteal phase is the part of your menstrual cycle that prepares your uterus for pregnancy by thickening your uterine lining. Typically it happens around day 15 of a 28-day ...