leucorrhea. It is a viscous white liquid that women flow out of vagina. It is made up of secretions from vestibular gland, cervical gland and endometrium, exudate from vaginal mucosa and exfoliated vaginal epithelial cells. Leucorrhea contains lactobacillus, lysozyme and antibody, so it can inhibit the growth of bacteria. During sexual behavior, leucorrhea will increase, which will lubricate the vagina and facilitate sexual life. Generally, leucorrhea increases in the middle period of menstruation, which is thin and transparent; After ovulation, leucorrhea becomes sticky, turbid and less. Leucorrhea increased before menstruation and during pregnancy.