What happens to women in advance?

There are several situations in which women show early menstruation. First, endocrine disorders, which can cause insufficient luteal phase function, thus showing early menstruation. Second, early withdrawal or decline of ovarian function can show changes in the menstrual cycle and failure of follicles. Mature, reduced progesterone secretion and other manifestations. Third, endometrial tumor or endometrial cancer, these symptoms will cause the endometrium to show contraction, thus causing irregular bleeding in the vagina, fourth, uterine shampoo or inflammation caused by early menstruation.