Chest dyspnea has been associated with a variety of disease factors, mainly including respiratory and cardiovascular diseases; it may also be associated with extreme emotional stress. 1. Disease factors (1) Respiratory diseases: when dyspnea manifests itself, it should first be considered to be related to respiratory diseases, commonly including massive pneumonia, chronic obstructive pulmonary disease, bronchial asthma, emphysema and so on. (2) Cardiovascular diseases: Dyspnea may also occur in cardiogenic diseases, such as chronic heart failure, acute myocardial infarction, heart valve disease and so on. 2. Non-disease factors Normal people may have transient dyspnea under the condition of excessive emotional stress, and the symptoms of dyspnea may gradually return to normal after adjusting the emotions. When dyspnea occurs in the chest, you should consult a doctor as soon as possible to actively find the cause.