It is true that women may experience an increase in leucorrhea before menstruation because the ovaries secrete high levels of estrogen and progesterone a week before the onset of menstruation. Therefore, the stimulation of high levels of estrogen and progesterone will lead to a significant increase in vaginal discharge, but usually a yogurt-like curd-like leucorrhea and no abnormal discomfort. There will be no itching of the vulva, no significant odor, and no redness, swelling or stinging of the vulva. If a woman not only has increased leucorrhea before her period, but also has yellow leucorrhea, vulvar itching or a distinct odor, or even a red and swollen vulva, this is not a normal sign. For example, mycotic vaginitis can occur before menstruation and cause bean-like leucorrhea with vulvar redness, itching and tingling.