If the leukorrhea becomes yellow before the menstrual period, it is an abnormality and is clinically common for several reasons. The first one is an inflammation of the vagina itself, which can cause this symptom. The second is caused by chronic cervicitis, often accompanied by pain in the lumbosacral region. The third one may be caused by inflammation of the pelvis, which may result in increased discharge and yellowing of the leucorrhea. It is recommended to do the corresponding examination, if necessary, routine laboratory tests of the white belt, as well as gynecological examination, to understand whether the local cervical congestion, edema, yellowing of the discharge, in the clinical can make a preliminary diagnosis. In addition when doing gynecological double examination, if there is pelvic inflammatory disease, there will be pressure pain in the uterine adnexa, and clinically after sexual exertion, the pain in the lower abdomen will often appear to be aggravated. Therefore, no matter what the cause is, timely treatment should be given for this pathological phenomenon.