A woman’s chest pain, i.e. breast swelling and pain, may be a physiological phenomenon caused by menstruation, etc., or it may be caused by mastitis, breast hyperplasia, breast nodules and other diseases. You should consult a doctor in time to find out the cause of the problem. 1. Physiological phenomenon: Before or during menstruation, women may experience breast swelling and pain, which is caused by changes in estrogen in the body. If the swelling and pain is more obvious, use a towel to apply localized hot compresses. If you are pregnant, you may experience breast tenderness due to hormonal changes in your body, which is a physiological phenomenon and does not need to be treated. 3. Mastitis: When a woman is breastfeeding, because the milk ducts are not smooth or the baby can not suck the milk in time, it can cause milk stagnation, which leads to breast swelling and pain. You need to empty the milk in time and do a good job of cleaning your breasts to avoid mastitis. 4. Breast hyperplasia: It is the most common benign breast disease, manifested by breast pain, nodules or lumps, and some patients combined with nipple discharge. In rare cases, there is a risk of developing breast cancer. 5. Breast nodules: Mostly found during physical examination, further breast ultrasound and X-ray can be done to evaluate the nodules. Benign nodules may have periodic swelling or tenderness, which occurs or worsens in the pre-menstrual period, and decreases or disappears after the onset of menstruation. Malignant lesions are ill-defined, hard, and poorly mobile, and some are associated with nipple discharge and nipple dimpling. Benign lesions can be followed up regularly for examination, while malignant lesions should be treated with surgery in time. In addition to the above causes, breast trauma, cardiothoracic diseases, herpes zoster can also cause chest swelling and pain, if a woman’s chest swelling and pain should be timely consultation, please ask the doctor to clarify the cause of the disease, and if necessary, to carry out appropriate treatment.