The yellowing of the leucorrhoea is not due to menstruation. The leucorrhoea will turn brown or pink when menstruating, but will not appear yellow. If you have pelvic inflammatory disease or cervicitis, it can also cause yellow discharge. Pelvic inflammatory disease can also cause lumbago and back pain, etc. You need to go to the hospital for routine examination of the white belt, ultrasound and colposcopy. You can use suppositories to treat vaginitis, such as metronidazole suppositories, and pelvic inflammatory disease, and gynecological gold tablets, and pay attention to vulvar hygiene, and do not have intercourse during treatment.