It is advisable to go to the hospital for a systematic, standardized, and reasonable examination before menstruation if you experience breast swelling and pain, in order to rule out diseases that could cause such symptoms, such as mastitis in women, mammary hyperplasia, or breast cancer, etc. If these organic changes in the female breast are ruled out and the pain is considered to be caused by premenstrual syndrome, you may gently massage under the doctor's advice and guidance to alleviate the pain. Be gentle and slow in your approach, and pay attention to the technique; do not pinch or squeeze with excessive movements. Please follow the doctor's advice for specific actions. If you have further questions, please consult a doctor at the hospital.