Endocrine therapy for hormone receptor (ER, PR) positive breast cancer patients is quite important. It is a very effective and safe treatment for both postoperative adjuvant and post-recurrence metastases. However, the drugs used in premenopausal and postmenopausal endocrine therapy are different, so triamcinolone is more commonly used before menopause, while aromatase inhibitors are more commonly used after menopause. If we say that the use of triamcinolone acetonide after menopause can be justified, but the use of aromatase inhibitors before menopause violates the principle, because aromatase inhibitors are developed for the conversion of androgens to estrogens in postmenopausal women. This is why it is important to know how to know if you are menopausal.