Endocrine therapy is an important means of breast cancer treatment, and determining whether a patient is menopausal is a prerequisite for endocrine therapy. Menopause is a manifestation of ovarian failure, and stopping menstruation does not indicate that a patient has reached menopause, and the Breast Cancer Professional Committee of the Chinese Anti-Cancer Association released the Chinese Menopause Consensus in 2011, which applies to some breast cancer patients in China who have not reached menopause at the time of surgery or before drug therapy, and who The consensus applies to those who have not reached menopause at the time of surgery or before drug treatment, but no longer have menstruation during or after receiving chemotherapy and/or endocrine therapy. The following are the criteria for determining menopause in China. Patients with intact uterus 1. aged ≥50 years, who have been amenorrheic for at least 12 months after chemotherapy or while taking SERM drugs (selective hormone receptor modulators), and whose estradiol (E2) and follicle stimulating hormone (FSH) levels have reached postmenopausal levels for at least three consecutive measurements 2. aged 45-50 years, who have been amenorrheic for at least 24 months after chemotherapy or while taking SERM drugs (selective hormone receptor modulators), and who have been amenorrheic for at least 24 months while taking SERM drugs (selective hormone receptor modulators) 3. Patients younger than 45 years of age who have reached postmenopausal levels in at least three consecutive measurements of estradiol (E2) and follicle-stimulating hormone (FSH) levels due to the higher probability of recovery of ovarian function, in principle, this criterion does not apply. 2. Patients aged 45-50 years who have completed two years after chemotherapy and have had their estradiol (E2) and follicle stimulating hormone (FSH) levels measured at least three times in a row within one year to reach postmenopausal levels. 3. Patients aged less than 45 years have a higher probability of recovery of ovarian function. In principle, this criterion does not apply. In conclusion, menopause is far from being as simple as stopping menstruation, and a specialist must determine whether a patient is menopausal based on age, time of menopause after treatment, and estradiol (E2) and follicle-stimulating hormone (FSH) levels.