The yellowish leukorrhea of the menstruation period should be considered to be caused by bacterial infection or HPV or viral infection, and so on. We should observe whether there is any peculiar smell of the leukorrhea or whether there is any itching and pain in the vulva and vagina. You can go to the regular hospital for routine examination of the leukorrhea, as well as cervical TCT and HPV examination. If the examination is an abnormal phenomenon, the need for timely treatment through the vaginal medicine, such as bacterial vaginitis, can also cause yellowish odor, you can use the vaginal medicine, the use of metronidazole class of drugs, usually about a week of medication can be cured. If you have trichomonas vaginitis, you need to treat both men and women at the same time, and usually pay attention to their own cleanliness.