The presence of gynecological inflammatory diseases, such as vaginitis and endometritis, is considered in the case of yellow vaginal discharge. Inflammation stimulates the mucosal cells and leads to increased exudation, resulting in increased, thin or watery secretions. The secretions are often accompanied by necrotic mucosal cells and pathogenic microorganisms, making the secretions yellowish in color. Trichomonas, mycobacteria, bacteria, and mycoplasma are common pathogenic microorganisms that cause gynecological inflammation, and it is advisable to have a routine examination of vaginal secretions for symptomatic treatment. When malignant tumor of gynecological organ tissue occurs, the effect of tumor cells will also show the above symptoms. The vaginal discharge may be accompanied by bleeding, so it is recommended to go to the hospital for hysteroscopy to find the cause and treat it actively.