The presence of breast swelling and pain before menstruation is due to the continuous exuberance of progesterone in the body. In addition, progesterone needs to be withdrawn before menstruation, which can stimulate the blood vessels of the breast and cause breast swelling and pain. It can also be accompanied by breast enlargement, breast cysts, and breast lumps, which can be affected by hormonal changes in the body and can cause pain. If you eat some spicy and stimulating food before your period, including cold food, or even if you stay up late frequently and have mood swings, it may cause breast pain. In this case, you can massage or apply hot compresses to relieve the pain. As long as it slowly subsides after your period is over, there is no problem. If it persists, you must go to the hospital to register for a mammogram, and depending on the situation, you can take oral medication to regulate it.