Normal leukorrhea is white in color, thin paste or egg white in shape, sticky, small amount, and has no fishy smell. Leukorrhea is formed by the mixture of vaginal mucous membrane exudate, cervical canal and endometrial gland secretion, mainly affected by estrogen. Physiological leukorrhea is white, viscous, thin paste or egg white-like discharge, with a small amount and no fishy odor. However, when combined with inflammation of the reproductive tract, such as vaginitis, cervicitis, or when cancer occurs, the color, secretion volume and disposition of the leukorrhea will change. Increased leukorrhea with vulvar itching is usually seen in vaginitis, cervicitis or pelvic inflammatory disease, etc., which can be clearly diagnosed by combining with medical history and vaginal secretion examination. Bloody leukorrhea can be seen in cervical cancer, endometrial cancer, cervical polyps and so on. Therefore, when the leukorrhea is abnormal, you need to go to the hospital in time to find out the cause and deal with it actively.