Period Frenzy

When a woman gets her period twice in the same month.

Woman: Oh my gosh! I just got my period for the second time this month!
Other Woman: Wow! You are having a period frenzy!!

Period Mania

The scientifically proven phenomenon where women, who live and spend time together frequently, develop similar menstrual cycles as each other. The cause is yet to be determined.

Those girls are so close, I hear they have period mania.