Normal physiological leukorrhea presents egg white, white thin paste, usually no fishy odor, the amount of how much is related to the high and low levels of estrogen. Leukorrhea is a mixture of cervical gland secretion, vaginal mucosal exudate, endometrial gland secretion, containing leukocytes, lactobacillus, vaginal epithelial exfoliated cells and so on. Pathological leukorrhea can be caused by infection and foreign body stimulation. During puberty, when the ovaries gradually develop and secrete estrogen, the female organism begins to discharge leukorrhea, and near the time of ovulation, due to the rising level of estrogen and progesterone, the endocervical glandular cell secretion will be exuberant, and then there is an increase in the amount of leukorrhea, and a thin, egg-white consistency. Clinically, 2 to 3 days after ovulation, the leukorrhea becomes cloudy and sticky, with a small amount, which usually has no effect on women’s health.