If the patient has chest tightness and dyspnea: 1, the most common cause is cardiogenic diseases, such as coronary heart disease, unstable angina, acute myocarditis, acute pericarditis, infective endocarditis, hypertrophic obstructive cardiomyopathy, heart valve disease, these conditions can cause coronary artery ischemia, stenosis or spasm, then there will be chest tightness, shortness of breath, dyspnea, dyspnea and other clinical symptoms and performance. 2.If patients have the above symptoms, they should consider respiratory system diseases, such as serious lung infections, pleural effusion, various types of pneumothorax caused by various factors, and large area of pleurisy, which will also have chest tightness and dyspnea caused by the decrease of blood oxygen saturation. 3.If patients often have the above symptoms, they should consider endocrine diseases, such as abnormal thyroid function and adrenal gland dysfunction. This symptom is present in the case of abnormal thyroid function and adrenal gland dysfunction. 4.For patients with plant nerve dysfunction, especially in cardiac neurosis, this symptom is also present.