Chest tightness can be triggered by the following conditions: first, heart disease, considering transient insufficient blood supply to the heart area, that is, angina pectoris, if the symptoms of chest tightness, only occasional episodes, can be temporarily observed first, without treatment. Secondly, related to the recent lack of sleep, overwork, need to take a good rest, it can be relieved. Once again, it is considered that you are suffering from breast disease, mastitis as well as breast hyperplasia may have pain, triggering the tightness of the breasts. Finally, it may be triggered by improper sucking of the child and milk stagnation during breastfeeding, or it may be triggered by myocarditis, asthma, bronchitis, or cold weather, so it is recommended to go to the relevant department of the hospital in time for further examination.