Leukorrhea is a colorless, odorless, sticky fluid that flows from the vagina. Leukorrhea keeps the vagina and vulva moist as necessary to avoid dryness of the vulva causing dryness and discomfort; it also inhibits the growth of germs in the vagina; the secretions from the cervix prevent outside bacteria from invading the body. The leukorrhea will change with the menstrual cycle. Generally, after the menstruation is clean, the amount of leucorrhea is small; the leucorrhea increases in the middle days of the menstruation again and before coming to menstruation. Older people have less leucorrhea and young adults have more leucorrhea; thin people have less leucorrhea and fat people have more leucorrhea. In the case of gynecological diseases, patients often find that the leucorrhea is not normal, such as leucorrhea in large amounts, smelly, with blood, become like tofu sludge, etc.. Therefore, leucorrhea is very meaningful for detecting diseases. Since leukorrhea flows from the vagina, laboratory examination of leukorrhea by doctors also helps in the diagnosis of gynecological diseases. What gynecological diseases may be signaled by abnormal leucorrhea? A lot of leucorrhea, yellowish, thin, with a distinct odor and mild itching of the vulva is likely to be trichomoniasis. White, white, thick, sticky leucorrhea with a fishy smell and no or mild itching of the vulva is likely to be bacterial vaginosis. Increased, white, lumpy, tofu-like leucorrhea with marked itching or unbearable itching of the vulva is typical of mycosis fungoides. It is more likely to have pelvic inflammatory disease, cervical erosion, and early stage of cervical cancer. The leucorrhea is abundant, red and smells strange, like meat washing water, which should be a sign of cervical cancer. Warm tip: timely medical treatment is the key to detect abnormal leucorrhea and treat the cause.