The clear fluid that flows from the vagina is leukorrhea, which is a mixture of fluids from the female vagina, cervix and endometrial glands. The quality and quantity vary with the menstrual cycle and are related to the concentration of estrogen. In general, leukorrhea is milky white, sometimes transparent, small in volume, odorless and slightly sticky. During ovulation, the leucorrhea increases and is more viscous like egg white and transparent. Before and after menstruation, leukorrhea also increases and may be blood-colored because of pelvic congestion. The leukorrhea contains many kinds of bacteria and antibodies, so it can inhibit the growth of bacteria, and the water in the leukorrhea can keep the vagina moist. If there is an increase in leukorrhea, color change or odor, there is a possibility of inflammation and you need to go to the hospital for examination, such as vaginal discharge examination, for timely treatment. Women should usually choose loose cotton underwear and change underwear regularly, pay attention to sterilization, rinse the vulva with water to keep it clean.