Menstruation, often known as menses, or period, is part of a woman’s normal sexual health during their reproductive years. It happens when your body discards the monthly build-up of your uterus lining (womb). If you do not get pregnant, your estrogen and progesterone hormone levels begin dropping which then signals your body to begin menstruation.
Menstrual blood and tissue flow from your uterus through the small opening in your cervix and pass out of your body through your vagina. The length of a menstrual cycle varies from woman to woman. On average it is approximately every 28 days; however, there are women with cycles that are longer or shorter than this, some from 21 to 40 days or even longer.