There are many reasons for the sudden manifestation of chest pain, including: first, if the patient is a young person, the possibility of spontaneous pneumothorax is higher, especially for high school students, long and lean body type patients with high life or study pressure. In addition, pneumothorax is also likely to occur after secondary infection of lung tissue, and the patient will also have chest tightness, and in serious cases, further surgical treatment is required as an option. Secondly, myocardial ischemia occurs more often in elderly patients, especially if they have hypertension and other underlying diseases, which can be induced after exertion, and ECG examination can further confirm the diagnosis. Thirdly, previous lung tissue infection will leave behind pleural thickening and local fibrous striae, which will also cause pain.