Shortness of breath is considered to be related to physiological factors such as strenuous exercise and over-excitement, and is also considered to be caused by diseases such as chronic bronchitis, asthma, chronic obstructive pulmonary disease, and heart failure. 1. Physiological factors: in the body of strenuous exercise, over-excitement, etc., the phenomenon of shortness of breath may occur. 2. Chronic bronchitis: the etiology of the disease is not completely clear, and may be related to pathogen infection, impaired immune function, airway hyperresponsiveness and so on. Typical symptoms of patients include coughing, coughing up sputum, wheezing, shortness of breath, and so on, and may also be manifested as shortness of breath. 3. Asthma: Asthma is related to genetic factors, environmental factors and respiratory tract infections. Common symptoms include wheezing, shortness of breath, chest tightness, cough, cyanosis, dyspnea, etc. It can also manifest as asthma. 4. Chronic obstructive pulmonary disease (COPD): the disease will cause asthma, but also easy to be accompanied by coughing, coughing up sputum, dyspnea, chest tightness, wheezing and other symptoms. COPD is associated with genetic factors, aging, smoking and other factors. 5. Heart failure: the disease is related to myocardial lesions, heart overload and so on. Early heart failure performance is not obvious, but there are some patients will appear shortness of breath, chest tightness, double lower extremity edema, body weakness and other symptoms, but also shortness of breath. There are many causes of shortness of breath, such as bronchial foreign body, lung abscess, tuberculosis, lung cancer, spontaneous pneumothorax, myocardial infarction and so on. It is recommended that people with shortness of breath consult a doctor for examination so that the disease can be clarified and treated according to the doctor’s instructions.