If a young woman has pain in the area where the rib cage and sternum are connected on both sides, most of them have costochondritis, i.e. aseptic inflammation, especially young women are especially prone to this condition, and the pain occurs when they breathe or inhale deeply, which is usually not a big problem, and most patients will be gradually relieved in about 1 week. If there is severe pain above the chest and subclavian area, accompanied by severe breathing difficulties, especially in tall and thin women, it is highly suspected that there may be a pneumothorax, and it is recommended to seek medical attention and take chest X-ray in time to determine whether a pneumothorax or other serious diseases have occurred, so as to avoid misdiagnosis and omission.