Leukorrhea, white color, if there is no itching or odor and other abnormal symptoms, generally considered normal, leukorrhea is a normal physiological secretion of women, is composed of the uterine cavity, the cervix, the vagina, shed epithelial cells and secretion of fluids and so on. The normal secretion of leukorrhea is greatly affected by changes in female hormones. In different menstrual cycles, estrogen and progesterone in the body will undergo different changes, so it will also affect the changes in leukorrhea. Generally in the pre-menstrual period and ovulation period the amount of leukorrhea is relatively large, the normal color is white or milky white, ovulation leukorrhea will also appear transparent filament changes, under normal circumstances will not appear yellow or yellow-green, otherwise consider the existence of pathogenic bacteria infection may be, there will be a change in the nature of the leukorrhea, manifested as a dilute or curdled milk lumps, accompanied by fishy odor, the need to go to the hospital in time to see a doctor.