The common colors of leucorrhea are white, yellow, purulent, and bloody. A small amount of white is normal, and the latter ones are abnormal. They are found in gynecological inflammation, pregnancy, endocrine disorders, gynecological tumors, etc. Normal leucorrhea is white paste or egg white-like, sticky, no fishy smell, and small in amount. It is called physiological leucorrhea. When inflammation of the reproductive tract such as vaginitis and acute cervicitis or cancer occurs, the amount of leucorrhea increases significantly and its characteristics change, which is called pathological leucorrhea. Common clinical ones include:

Transparent and sticky leucorrhea: The appearance is similar to normal leucorrhea, but the number is significantly increased. The possibility of ovarian dysfunction, vaginal adenosis, or well-differentiated cervical adenocarcinoma should be considered. Gray-yellow or yellow-white foamy thin leucorrhea: This is a characteristic of trichomonal vaginitis and may be accompanied by vulvar itching. Curd-like or bean-dregs-like leucorrhea: This is a characteristic of vulvovaginal candidiasis and is often accompanied by severe vulvar itching or burning pain. Gray-white homogeneous fishy-smelling leucorrhea: common in bacterial vaginosis, accompanied by mild vulvar itching.

Purulant leucorrhea is yellow or yellow-green in color, sticky, and often smelly: it is caused by bacterial infection. It can be seen in Neisseria gonorrhoeae vaginitis, acute cervicitis and endocervicitis. Vaginal cancer or cervical cancer complicated by infection, pyometra, or foreign body residue in the vagina can also cause purulent leucorrhea. Bloody leucorrhea: The leucorrhea is mixed with blood, and the amount of blood varies. Cervical cancer, endometrial cancer, cervical polyps, cervicitis or uterine submucosal fibroids should be considered. Placement of an intrauterine device can also cause bloody leucorrhea. Watery leucorrhea: Those with persistent discharge of rice-watery leucorrhea with a strange odor are generally late-stage cervical cancer, vaginal cancer or submucosal fibroids accompanied by infection. Intermittent discharge of clear, yellow-red or red watery leucorrhea should consider the possibility of fallopian tube cancer.

Normally, normal leucorrhea should be white or transparent and odorless. The amount of leucorrhea will also change with the menstrual cycle. Generally, in the few days before menstruation or just after menstruation, the leucorrhea will become slightly more abundant and the color will become turbid. This is because there are more exfoliated cells in it. During the ovulation period, the leucorrhea will also increase and become transparent, looking like egg white, thicker and stringy. After ovulation, the amount of leucorrhea will decrease. In addition, vaginal discharge may also increase during pregnancy or after sexual intercourse.