Menstruation is part of the menstrual cycle, a monthly process that women of reproductive age experience.
During menstruation, an egg is released from your ovaries. As the egg makes its way down your fallopian tubes, your uterus creates a lining of extra blood and tissue designed to help nourish the fetus if pregnancy occurs.
If the egg isn’t fertilized during your menstrual cycle, your body sheds the lining of extra blood and tissue. Your body dissolves or absorbs the egg, and your menstrual cycle begins again.