There is no precise sign of menopause in women. There is a perimenopausal period of six months to one year before menopause, during which symptoms are more common. The ovaries are the female internal reproductive glands that secrete estrogen and progesterone, ovulate periodically, produce menstruation, and maintain the secondary sex characteristics of women. However, as women age, ovarian function declines and most women between the ages of 45 and 55 enter perimenopause. The decline in ovarian function during perimenopause leads to a decrease in estrogen and progesterone secretion levels in the body. During this stage, women will experience disorders in their menstrual cycle, such as prolonged or shortened menstrual periods, irregular menstrual cycles, and low or continuous menstrual flow. In addition, some women may experience hot flashes, sweating, insomnia, sleeplessness, irritability and other symptoms. However, menstrual disorders are not a sign of pre-menopause because some gynecological diseases can also cause menstrual cycle disorders. Therefore, women approaching menopause who experience menstrual disorders should first complete a gynecological examination to rule out possible diseases, such as endometrial cancer, fibroids, etc. If there is no gynecological pathology, the woman should be examined by a gynecologist. In the absence of gynecological problems, if the menstrual cycle becomes irregular, it usually takes six months to a year to reach menopause.