Before menopause, the amount of menstruation is more or less individual differences, some people’s menstruation slowly decreases until menopause, and some people’s menstruation increases to form dysfunctional uterine bleeding, and then slowly menopause. 1. Decrease in menstrual flow: A menstrual flow of less than 20ml is considered to be a decrease in menstrual flow. Before menopause, due to the decrease of hormone level in the body, the menstrual flow decreases, and then the menstrual flow will slowly stop. 2. Increased menstrual flow: If the menstrual flow is more than 80ml, it is considered as excessive menstrual flow. Before menopause, due to the unstable hormone level in the body, the progesterone decreases, and the endometrium shows proliferative changes, which leads to breakthrough bleeding, causing heavy menstruation and prolonged bleeding time, thus forming the phenomenon of dysfunctional uterine bleeding. If there is a significant increase in the amount of menstruation before menopause, accompanied by other uncomfortable symptoms, it is recommended to consult a doctor in a timely manner, complete the relevant examinations, and clarify the cause of the disease under the guidance of a professional doctor, so as to provide targeted treatment.