Chest pain may be caused by the following conditions: first, may be suffering from breast enlargement, mainly because the patient’s body endocrine hormone imbalance caused by breast enlargement, there will be chest pain, breast lumps and other symptoms, especially before the onset of menstruation more obvious. Secondly, mastitis, mostly caused by bacterial infection, may lead to pain, redness and swelling in the breasts. Thirdly, it may be due to advanced breast cancer, which may cause breast pain due to the lesion of thyroid tissue. Fourthly, it may be caused by trauma, especially after a violent collision, which may lead to muscle contusion in the breast area and cause pain. Fifth, it may also be due to inflammation of the lungs or pleurisy. Considering that many kinds of diseases may cause chest pain, it is best to go to the hospital to confirm the diagnosis and then carry out the corresponding treatment.