The most common causes of leukorrhea are contamination of the leukorrhea and inflammation of the reproductive system, with vaginitis and cervicitis being the most common, mainly due to bacterial and viral infections of the vagina. The leukorrhea normally contains certain bacteria and the normal vaginal flora can play a role in vaginal self-cleaning, but if it contains miscellaneous bacteria, it can lead to dysbiosis of the normal vaginal flora, which can disrupt the normal pH of the vagina and lead to vaginitis, and upward infection can lead to cervicitis and even adnexitis and pelvic inflammatory disease. Contamination may occur during the collection of the leucorrhoea specimen, such as failure to cleanse the perineum before the examination, and improper handling may lead to contamination and leucorrhoea, but the patient will not experience discomfort.