Sudden chest tightness and shortness of breath are generally considered to be related to emotional factors, coronary heart disease, angina pectoris, myocardial infarction and other cardiovascular diseases, bronchial asthma, pneumothorax and other pulmonary diseases. 1. Emotional factors: patients in emotional excitement can lead to increased sympathetic nerve tone, increased myocardial oxygen consumption, heart rate will lead to coronary artery insufficient blood supply, inducing sudden chest tightness, shortness of breath. 2. Cardiovascular diseases: such as coronary heart disease, angina pectoris, myocardial infarction, acute heart failure and other patients with myocardial ischemia further aggravated leading to cardiac systolic-diastolic dysfunction, insufficient blood supply to the heart, which can be manifested as sudden chest tightness, chest pain, shortness of breath, panic and other discomforts. 3. Lung diseases: such as bronchial asthma patients exposed to allergic factors, can trigger a sudden asthma attack, manifested as dyspnea, accompanied by chest tightness and shortness of breath. Pneumothorax patients with ventilation dysfunction after lung tissue compression can also experience sudden chest tightness and shortness of breath. If patients experience sudden chest tightness and shortness of breath, it is recommended that they visit a hospital to identify the cause.