Because there is exudate from the vaginal mucosa and secretion from the cervical canal and the glands of the endometrium, these secretions mix and form leukorrhea. The formation of leukorrhea is related to the action of estrogen. Normally, the amount of leukorrhea changes with the menstrual cycle. The amount of leucorrhea is relatively small and relatively sticky when the menstrual period has just cleared. In the middle of menstruation, when the ovaries are about to ovulate, as the secretion of the cervical glands begins to flourish, the leucorrhea also begins to increase and is transparent, like egg white, with a particularly good degree of lacrimation. Two to three days after ovulation, the leucorrhea starts to become cloudy and sticky, and the amount starts to decrease. By the time of menstruation, leukorrhea increases again due to pelvic congestion and exudate from the vaginal mucosa.