The most common cause is inflammation of the vaginal mucosa, when the vaginal mucosa is inflamed it will lead to increased secretions and may be accompanied by vulvar itching or odor of secretions, it is recommended to go to the hospital for routine laboratory tests of the white belt if necessary. 2. Inflammation of the cervix will lead to yellow secretions, so the underwear will also be yellow and the secretions will be relatively sticky. The patient may have pain in the lumbosacral area. 3, may be caused by inflammation of the endometrium, or pelvic inflammatory disease, because the local inflammation will lead to a large number of exudation, so the color of the discharge will also become yellow, in daily life will be repeated lower abdominal pain, or manifested as dysmenorrhea, it is recommended to promptly check, according to the diagnosis and then give treatment.