"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Let’s take a mental trip back to seventh-grade health class. When you got to the unit on menstruation, ...

The menstrual cycle is a 21-35 day hormonal cycle during which estrogen and progesterone levels change to prepare the body for pregnancy. As hormones change throughout the month, you will experience ...

New study shows that the lengths of menstrual cycles, follicular phases (before egg release) and luteal phases (after ovulation) are all variable. The luteal phase is importantly more variable than ...