There are many causes of chest pain, not necessarily 15 diseases, including circulatory system diseases, respiratory system diseases, chest wall diseases, mediastinal diseases and so on. 1. Circulatory system diseases: including angina pectoris, acute myocardial infarction, mitral stenosis, hypertrophic cardiomyopathy, acute pericarditis, aortic coarctation, aortic aneurysm and so on. 2. Diseases of the respiratory system: including acute pleurisy, pleural malignant tumor, pneumothorax, lobar pneumonia, lung cancer and so on. 3. Chest wall diseases: including acute dermatitis, herpes zoster, intercostal neuritis, costochondritis, leukemia infiltrating the sternum, multiple myeloma, etc. 4. Mediastinal diseases: including mediastinitis, mediastinal emphysema, mediastinal tumor, esophagitis, esophageal cancer, esophageal hiatal hernia and so on. Chest pain is a common clinical symptom, many diseases can cause chest pain, chest pain, it is recommended that patients go to the hospital as soon as possible, so as not to delay the condition.