The necessity of understanding the female menstrual cycle. The female menstrual cycle is innate and lifelong. It includes two parts: menstrual period and ovulation period. The necessity of understanding the female menstrual cycle is that women can better maintain their health by understanding their physiological conditions. At the same time, understanding your own menstrual cycle can also help women seize the appropriate time for natural conception or contraceptive measures, thereby reducing the risk of unwanted pregnancy. Menstrual periods and ovulation