Leukorrhea is a white fluid secreted from the female vagina. Normally, the amount of leukorrhea is relatively small, and it is white and pasty in color. Before puberty, there is no leukorrhea. The formation of leukorrhea is closely related to estrogen, and after puberty, the ovaries begin to develop and secrete estrogen, at which time leukorrhea appears. After the appearance of menstruation the leucorrhea also undergoes many changes, sometimes more, sometimes less. Generally, in the middle of two periods, that is, during ovulation, the amount of leucorrhea is more and appears transparent and drawn. Frequent sexual intercourse, pregnancy, menopause leucorrhea will occur a lot of changes, if a lot of abnormalities occur, it is a sign of abnormalities in the body, must pay more attention to observe.