If the patient has chest tightness accompanied by rapid heartbeat, the following points should be considered: First, endocrine metabolic diseases, such as hyperthyroidism, hyperparathyroidism, hyperadrenalism, there will be chest tightness, rapid heartbeat, palpitations, clinical symptoms and reactions. Secondly, if the patient develops diseases of cardiac origin caused by various factors, such as coronary artery disease unstable angina, acute myocarditis, acute pericarditis, infective endocarditis, or cardiac arrhythmia or heart failure caused by various conditions, there will be tightness in the chest, shortness of breath, rapid heartbeat, and discomfort in the precordial area. Third, for patients who have respiratory diseases, in severe lung infection, pleurisy, pleural effusion, there will also be chest tightness, shortness of breath, tachycardia. Fourth, if the patient has poisoning caused by various factors, such as acute food poisoning or acute drug poisoning, there will be the above clinical symptoms and manifestations.