The pain is related to the menstrual cycle. The pain starts before menstruation, and the symptoms are relieved or disappear after the menstruation, and the lumps of the breast can be touched when the pain disappears. This is due to excessive hyperplasia of breast tissues and recurrent insufficiency caused by the imbalance of estrogen and progesterone in women’s body. If the pain is not relieved, further detailed examination is needed to rule out malignant tumors and, if necessary, surgical treatment. The pain in the chest can also be seen in acute mastitis, which occurs during the lactation period of primiparous mothers, with local redness, swelling and pain due to milk stagnation, and requires timely lactation treatment at the hospital.