There are several reasons for vaginal discharge, and there are two main possibilities to consider when vaginal discharge occurs in a non-pregnant state: first, chronic endometrial inflammation and inflammation of the fallopian tubes. Sudden vaginal discharge can occur when there is fluid production, especially more likely to occur during ovulation. Patients usually have no pain, discomfort, leukorrhea, may be accompanied by abdominal drop or lumbago during ovulation or menstruation, and may have uterine tenderness, thickening of the adnexal area, and tenderness when doing gynecological internal examination. Second, women’s cervix, endometrium and other neoplastic lesions. In this case, the vaginal discharge has foul smell or mixed with blood, which is mostly caused by the excessive proliferation of tumor cells and local necrosis with infection. In pregnancy, vaginal fluid is mainly considered to be amniotic fluid, before the fetus is not mature, vaginal fluid is very dangerous, stillbirth, preterm labor and uterine cavity infection is very likely, need to go to the hospital in time.