Leukorrhea is a mixture of vestibular gland secretions, vaginal mucosal exudate, cervical glands and endometrial glands secretions, containing vaginal epithelial cells, white blood cells and some non-pathogenic bacteria. In healthy condition, leucorrhea is white mucus-like or egg-white like, with small amount and no odor, which keeps the vagina moist for a long time and helps vaginal health, called physiological leucorrhea. Under normal circumstances, the quality and quantity of vaginal discharge change with the menstrual cycle. After menstruation, the vaginal discharge is small, white and pasty. In the middle of menstruation when the ovaries are about to ovulate, the leucorrhea increases due to the vigorous secretion of the cervical glands, which is transparent and slightly sticky like raw egg white. Two to three days after ovulation, the vaginal discharge becomes cloudy, thick and viscous with low volume. Before and after menstruation, leukorrhea often increases due to pelvic congestion and increased vaginal mucosal exudate. If the color, quality and quantity of leukorrhea change abnormally, it is called leukorrhea abnormality. A reminder: clinically most women with abnormal leucorrhea are caused by inattention to personal hygiene, normal people can clean their vulva with water. If there is no gynecological disease, it is better not to use too much female lotion. It has been reported that women who use vaginal douches have a 73% higher risk of pelvic infection than women who do not use vaginal douches, mainly because the douches used disrupt the self-cleaning function of the vagina, resulting in pathogenic bacteria taking advantage of the situation.