If there is yellow vaginal discharge may be physiological factors, but also may be trichomoniasis, cervicitis, chronic pelvic inflammatory disease and other disease factors caused. 1. Physiological factors: If there is only yellow discharge without obvious other symptoms, it may be due to recent life stress, irregular work and rest, high-fat and high-sugar diet, etc., can be relieved by adjusting lifestyle, without special treatment. 2. Disease factors: Trichomonas vaginitis is caused by vaginal infection with Trichomonas, there can be an increase in vaginal discharge, the color can be gray-yellow, yellow, etc.; cervicitis can also be increased secretion of leukorrhea, yellowish or grey, can be accompanied by pain during sexual intercourse, vaginal bleeding, etc.; chronic pelvic inflammatory disease can also be abnormal vaginal secretion, manifested as yellowish secretion color. There may be other reasons for yellow vaginal discharge, so it is recommended to go to the hospital for treatment.