The yellow discharge in late pregnancy may be caused by physiological or pathological factors. Normal physiological factors do not need to worry about, if it is pathological factors need to be actively treated, so as not to affect the health of the fetus and the mother. 1. Physiological factors: the cervix of the uterus and cervix increase in late pregnancy, the white belt in the vagina for a longer period of time, there will be a change in color, become yellow or dark yellow. If the secretion is only yellow and there is no vaginal itching or odor, then there is no need to worry, wash the vulva with water every day and change the underwear in time. 2. Pathological factors: Pregnant women entering the late stages of pregnancy may be due to the decline in resistance, the vagina is attacked by germs. If yellow discharge is accompanied by vaginal itching and odor, it may be vaginitis, which needs to be clarified by routine leukorrhea and then treated with medication under the guidance of a doctor.