Shortness of breath is a clinical symptom that gives the patient a clinical manifestation of dyspnea, palpitations, and weakness. Wheezing is caused by cardiogenic factors or respiratory system diseases. Common symptoms occur in coronary artery disease, unstable angina, arrhythmia, acute myocarditis, pericarditis, rheumatic heart disease, and hypertrophic obstructive cardiomyopathy are present, and patients experience varying degrees of myocardial cell ischemia and lack of oxygen, and will have wheezing on their own in a state of lack of oxygen. In addition, respiratory system diseases, such as chronic bronchitis, asthma, chronic obstructive pulmonary emphysema, pulmonary heart disease, these conditions can lead to a decrease in arterial oxygen saturation, low partial pressure of oxygen and high partial pressure of carbon dioxide, when there will be clinical symptoms and manifestations of chest tightness, shortness of breath and wheezing. For some factors of poisoning, such as nitrite poisoning in food poisoning, patients will also experience different degrees of wheezing.