Normal leucorrhoea is white and odourless liquid, yellowing of leucorrhoea may be some kind of disease, the causes of yellowing of leucorrhoea are as follows:

　　Yellowish leucorrhoea cause 1: yellow watery leucorrhoea, mostly due to necrosis of diseased tissues, commonly found in submucosal, sub, fallopian tube cancers.

　　Yellowish leukorrhea reason 2: one of the common, often caused by Candida albicans infection, mostly in pregnant women and diabetic patients, long-term application of broad-spectrum antibiotics can make the normal vaginal flora imbalance, conducive to the growth and reproduction of moulds and easy to suffer from this disease, taking corticosteroid hormones, immunosuppressive drugs and autoimmune disease patients are prone to suffer from this disease, vitamin B6 deficiency, patients with chronic wasting disease are prone to leukorrhea yellowish.

　　Young women wearing tight nylon trousers can make the perineum humidity and temperature increase, conducive to the growth and reproduction of mould. The main symptoms of mycobacterial sex are and vulvar itching, often accompanied by local burning sensation. Typical leucorrhoea is curd-like (tofu dregs-like) or slightly yellow flakes, slightly smelly, tightly adhering to the vaginal mucosa.

　　Yellowish leukorrhea cause 3: is the most common, caused by Trichomonas vaginalis infection, Trichomonas vaginalis is a kind of anaerobic parasitic protozoa, often parasitic in the genitourinary tract, women are mainly present in the vagina, but also present in the urethra, para-urethral glands, bladder and other parts of the body, and men are often parasitic in the urethra, prostate gland and other parts of the body.

　　Trichomoniasis is transmitted indirectly, i.e., through baths, tubs, towels, swimming pools, toilets, clothing, medical equipment, dressings and so on. The main clinical manifestations of trichomonas vaginitis are increased leucorrhoea, itching, burning or painful sensation of the vulva and phallus, typical leucorrhoea is yellowish-green, foamy, thin and has a fishy smell. When the inflammation invades the urethra, there may be symptoms of urinary urgency and frequency.

　　The reason for the yellowish leukorrhea is 4: it is mostly seen in older women who have been menopausal for many years. After menopause, ovarian function decline, endogenous estrogen lack, genital atrophy, vaginal epithelium thinning, local resistance is weakened, pathogenic bacteria are easy to reproduce and cause inflammation.