Cardiac shortness of breath is a common symptom, physiological and pathologic can occur, common diseases are cardiovascular system diseases, respiratory system diseases. 1. diseases of the cardiovascular system: coronary heart disease, arrhythmia can cause symptoms of chest tightness and shortness of breath, such as angina pectoris, myocardial infarction, atrial fibrillation, ventricular tachycardia, etc., usually accompanied by panic, cold sweat, crushing chest pain and other manifestations. 2. Respiratory diseases: such as chronic obstructive pulmonary disease, bronchial asthma, lung infections, etc. will appear chest tightness, shortness of breath, usually accompanied by cough and sputum, fever and other respiratory symptoms. 3. Other: such as tension, anxiety, hypoxia, this symptom can also occur. If the patient has chest tightness, shortness of breath, it is recommended to go to the hospital in time to identify the cause of the disease, and follow the doctor’s instructions for treatment.