When the heart is always in vague pain it may be caused by: 1. Diseases of the left chest wall, for example, including acute dermatitis, subcutaneous cellulitis, herpes zoster, epidemic chest pain, myositis, nonsuppurative rib osteitis, costal neuritis, rib fracture, multiple leukemia, multiple myeloma, etc. 2. Diseases of the cardiovascular system, such as angina pectoris, acute heart attack, myocarditis, acute pericarditis, or mitral, or aortic valve lesions, aortic aneurysm, ruptured aortic sinus aneurysm, pulmonary embolism, pulmonary hypertension, cardiac neurosis. 3, diseases of the respiratory system, including pleurisy, pleural tumors, spontaneous pneumothorax, pneumonia, acute bronchitis. 4, diseases of the mediastinum, including mediastinitis, mediastinal tumors, esophagitis, esophageal hiatal hernia, esophageal cancer, etc. 5, subdiaphragmatic abscess, liver abscess, splenic embolism, all of which can be caused.