Due to the increase of estrogen and progesterone, the epithelium of the vagina is shed faster and normally the leucorrhea does not decrease but increases. The main component of leukorrhea is cervical glandular secretions mixed with fluid exuded from the vaginal mucous membrane folds. After pregnancy, due to the increase of estrogen, both vaginal secretions and cervical secretions will increase and the leukorrhea will also increase, and the leukorrhea will be milky white with no odor or only a faint fishy smell. However, after pregnancy, some women are unable to increase their estrogen levels and remain at low levels due to decreased ovarian function and impaired estrogen production. The decrease of estrogen will cause the cervical mucus to become thick and poorly discharged, thus forming a cervical mucus plug to block the cervix, which further leads to a decrease of cervical mucus and vaginal epithelial cell secretions discharged from the vagina, thus some women will have less leucorrhea in early pregnancy. In addition, pregnant women who have had cervical surgery, such as laser, freezing, microwave or laparotomy, have had their cervical glands destroyed and are unable to produce the secretions that make up leukorrhea properly. The vaginal mucosal folds may also become impaired in prolonged dry conditions, further reducing the production of exudate, which clinically manifests as decreased leukorrhea.