Leukorrhea is actually a mixture of vaginal mucosal secretions, secretions from the cervix and endometrial glands, etc., and is influenced by estrogen and progesterone in the body. Under normal circumstances, with the menstrual cycle in the body of estrogen and progesterone levels of cyclic changes in the amount of leukorrhea, the character of the leukorrhea is also undergoing cyclical changes, rather than a static. Generally speaking, just after menstruation, the amount of leukorrhea is small; then gradually increase, to the ovulation period, by the body of estrogen levels rise, the leukorrhea gradually increase, the quality of dilute, color clear, appearance, such as egg white, can pull the filament; and after ovulation, estrogen levels gradually decrease, progesterone levels rise, so the leukorrhea becomes thick, creamy color, poor ductility, easy to break the wire. It is worth noting that before the onset of menstruation, the leukorrhea may be slightly yellow and thick. Physiological leukorrhea usually has no fishy odor. If the amount of leukorrhea changes, especially when accompanied by changes in its nature, color and odor, you should be alert for gynecological diseases. No change in the nature of the leukorrhea, only the increase in the amount of leukorrhea, should be considered whether the vaginal adenopathy, uterine hypertrophy, ovarian dysfunction, etc.; gray-yellow or yellowish-white thin foamy leukorrhea, often trichomonas vaginitis, can be accompanied by vulvar itching; curdled milky lumps or soybean dregs-like leukorrhea, for the vulvovaginal pseudo-filamentous yeast disease (Candida vaginitis, commonly known as mycosis fungoides) characteristics, often accompanied by severe vulvar itching or burning pain, Dry pain, etc.; gray-white homogeneous fishy odor leukorrhea: common in bacterial vaginosis, can be accompanied by mild vulvar itching; color yellow or yellow-green, sticky, more smelly pus-like leukorrhea: caused by bacterial infection. It can be seen in acute vaginitis, cervicitis, cervicitis or acute pelvic inflammatory disease, etc.; bloody leukorrhea mixed with blood (the amount of blood can vary): cervical cancer, endometrial cancer, cervical polyps, severe cervical erosion, submucosal uterine fibroids, etc. should be considered. Bloody leukorrhea can also occur after placing intrauterine device; watery leukorrhea: continuous discharge of rice-water-like leukorrhea with strange odor is usually advanced cervical cancer, vaginal cancer or submucosal fibroid with infection. Intermittent discharge of clear, yellowish-red or reddish watery leukorrhea should be considered as the possibility of fallopian tube cancer.