Chest pain for a few days and then no pain, mainly may be caused by three diseases: first, cystic hyperplasia of the breast, most often in women of childbearing age, is the endocrine hormone disorders in the body resulting in breast hyperplasia and degenerative abnormalities, clinical manifestations of bilateral breast pain and hyperplastic nodule formation, the degree of pain and nodule size with the menstrual cycle changes and changes. Secondly, intercostal neuralgia, which occurs mainly after exertion, is a pain distributed along the costal margin, mostly stabbing pain and not intense. Third, cardiac system diseases, such as coronary heart disease or myocardial infarction, can cause chest pain after emotional excitement, often accompanied by pain in the back, mostly crushing pain and intense, and the pain can be relieved after oral administration of isosorbide nitrate. Therefore, once the chest pain can be relieved for several days, you should go to a regular hospital to clarify the cause of pain and targeted treatment.