The menstrual cycle lasts from the first day of a person’s period to the day before the next period arrives. To an extent, it is normal for a person’s cycle length to vary from month to month. The ...

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 ...

Understand what a healthy menstrual cycle looks like, including its phases, typical length, and signs of balance. Learn when ...