If the patient has symptoms of heart pain during exhalation: First, cardiogenic diseases should be considered, such as coronary heart disease unstable angina pectoris, acute myocarditis, acute pericarditis, infective endocarditis or malignant arrhythmia, severe heart failure, will have clinical symptoms and manifestations of coronary artery ischemia and insufficient blood supply with chest tightness, shortness of breath and pain in the precordial region during exhalation. Second, for respiratory system diseases, patients with acute attacks of chronic bronchitis, acute bronchial asthma, pulmonary heart disease, or pneumothorax, acute pleurisy, pleural effusion, and massive lung infection caused by various factors will have painful symptoms in the heart during exhalation. Thirdly, for patients with cardiac neurosis, the clinical symptoms and clinical manifestations of pain in the precordial region during expiration will also occur when there is a disorder of the vegetative nervous system.