If you experience breast swelling and pain every time you are in the days before your period, it is mainly caused by endocrine disorders, most commonly when estrogen secretion is relatively high and progesterone secretion is relatively low, the mammary glands will experience localized swelling and pain under the action of estrogen. In daily life, you must maintain a good state of mind and ensure sufficient sleep, which will alleviate the situation of breast swelling and pain that occurs a few days before menstruation. If you still can’t improve through the daily life habits, you can take vitamin B1 orally for regulation, and you can also take Plus Flavor Easy Pill orally for regulation, which will significantly improve the situation, and you can’t get pregnant during the medication period. If you do not achieve the corresponding effect through medication, it is recommended to do an ultrasound examination of the mammary gland after the menstruation is clean to rule out the possibility of organic lesions.