The possible reason for the decrease in menstrual flow at the age of 47 is the physiological atrophy of the ovaries, which is a manifestation of entering the perimenopausal period, in addition to the possibility of anemia and other causes cannot be ruled out. A 47-year-old middle-aged or elderly woman may be in menopause, i.e. perimenopause. During this period, due to the physiological atrophy of the ovaries, the level of sex hormones (such as estrogen, progesterone, etc.) in the body decreases, the amount of menstrual flow will be significantly reduced, the menstrual cycle may be prolonged, and the duration of menstruation is shortened, which is a normal physiological phenomenon and does not require special treatment. However, reduced menstrual bleeding in a 47-year-old woman cannot exclude the possibility of anemia secondary to anemia, and it is necessary to go to the hospital to check the blood routine, ultrasound and other tests, combined with the results of the examination to make a comprehensive judgment. Therefore, the clinical occurrence of significantly reduced menstrual flow should be actively consulted, in accordance with the doctor’s advice and reasonable treatment.