If the pain and swelling of the chest occurs before the onset of menstruation, it is mostly considered to be caused by physiological phenomena, but it may also be related to factors such as breast enlargement, breast fibroids or cysts, etc. It is recommended to go to the hospital for examination to clarify the cause and then deal with it. Physiological factors: Women are in the late luteal phase before menstruation, when the level of estrogen and progesterone secretion decreases, leading to a significant increase in blood flow to the breast, in addition to chest pain, headache, emotional instability, easy fatigue and other discomforts, mostly in the 1-2 weeks before menstruation, and the symptoms can be gradually relieved after the end of menstruation. Pathological factors: 1, breast hyperplasia: If a woman has previous breast hyperplasia disease, coupled with the impact of hormonal changes before and after menstruation, the chest swelling and pain before menstruation will be more obvious, need to do regular breast examinations, can follow medical advice to apply hormonal drugs, iodine preparations and triamcinolone to relieve pain, can also apply vitamin A, vitamin E and other drugs to relieve discomfort; 2, breast fibroids or cysts: If the patient’s breast If a patient suffers from a tumor such as a fibroid, the breast gland will become congested, edematous, swollen and painful before the onset of menstruation, and if the swelling and pain cannot be relieved after the end of menstruation and continues to worsen, surgery is required to remove the breast lesion if necessary. Women need to establish a good lifestyle, maintain a relaxed mood, adhere to physical exercise, and actively participate in social activities, as well as mastering the methods of self-examination of the breast, and seek medical attention in a timely manner if abnormalities are found.