Aunt refers to menstruation, and breast swelling and pain before menstruation is mostly considered to be related to premenstrual syndrome and breast hyperplasia. 1. Premenstrual syndrome: due to changes in hormone levels during the premenstrual period, some patients may experience headaches, breast swelling and pain, fatigue and other discomforts, which can be relieved on their own after the onset of menstruation. 2. Breast Hyperplasia: Breast Hyperplasia is a common benign breast disease, due to the fluctuation of estrogen and progesterone levels in the body, which in turn leads to excessive proliferation of breast tissues, so patients will experience cyclic breast swelling and pain associated with menstruation and breast lumps. For patients with breast swelling and pain before the onset of menstruation, it is necessary to pay attention to maintaining a happy mood and relaxing appropriately. If the symptoms gradually aggravate, it is recommended to go to the hospital, complete the breast ultrasound and other related examinations, and then take active treatment under the guidance of the doctor after clarifying the cause of the disease.