This month menstruation is advanced a week what reason is

Menstruation is not more than 5 days in advance is a normal phenomenon, a week in advance belongs to irregular menstruation, occasionally a menstrual advance may be related to endocrine disorders, taking contraceptives, mental stress and other factors. If menstruation is often advanced, the menstrual cycle is significantly shortened, which may be related to premature ovarian failure, and may also be related to qi and blood needs and kidney deficiency.