Menstruation will stop after menopausal injection for breast cancer, and it is possible to resume menstruation after stopping the medicine for a period of time. The term “menopausal injection” refers to ovarian suppression therapy for pre-menopausal hormone receptor-positive breast cancer, which is used to treat breast cancer by suppressing the synthesis of estrogen in the ovaries, and can significantly increase the cure rate. Goserelin acetate, the drug name of the “menopause injection”, is usually used in combination with aromatase inhibitors as an adjuvant endocrine standard of care for premenopausal hormone receptor-positive breast cancer. It temporarily suppresses ovarian function to stop the menstrual cycle, and menstruation usually resumes when the drug is stopped. If the treatment process is already in the perimenopausal period, the drug may be discontinued and menstruation may resume directly after menopause without resumption of menstruation. It is recommended to check the sex hormone level regularly to assess the menstrual status as prescribed by the doctor, and to take the medication on time.