By now you've probably heard a lot of different things about your period. While some are clearly old wives' tales, others can be trickier to decipher. Whether you're wondering if it's safe to skip the Pill's placebos or if women in close proximity really do sync up their cycles, we've called in the experts to get to the bottom of some of the biggest menstruation myths out there.
1. Your hormones shift every seven years?
There's no such timetable. Your hormones are always shifting because that's what happens throughout the monthly cycle itself. But big-picture changes are also always going on. "Women's hormones are always shifting because the ovarian reserve [the supply of remaining eggs] gets lower and lower as we age," Nanette Santoro, MD, professor and chair of obstetrics and gynecology at the University of Colorado at Denver. The number of eggs in your ovaries in turn affects hormone levels. Specifically, as the number of eggs shrinks, levels of