Shortness of breath may be caused by bronchial asthma, chronic obstructive pulmonary disease, chronic bronchitis, and other diseases such as chronic pulmonary heart disease. 1. Bronchial asthma: Bronchial asthma may be caused by genetic and environmental factors, and patients will have wheezing, shortness of breath, chest tightness, cough, shortness of breath, nasal congestion and other manifestations. Therefore, the patient’s bronchial asthma attack will have out of breath thick shortness of breath and other symptoms. 2. Chronic Obstructive Pulmonary Disease (COPD): COPD is considered to be caused by heredity, long-term smoking and other factors. Patients will show cough, chronic cough, shortness of breath, dyspnea, wheezing, chest tightness. As a result, the patient will have symptoms such as out of breath thick shortness of breath. 3. Chronic bronchitis: the etiology of chronic bronchitis is not clear, it may be caused by mycoplasma, bacterial infection, or impaired immune function. Patients will not only have shortness of breath, but also cough, cough and other symptoms. 4. Other: patients with shortness of breath, but also consider the chronic pulmonary heart disease, coronary atherosclerotic heart disease and other diseases. It is recommended that patients with shortness of breath need to consult a doctor in a timely manner, the doctor will choose the appropriate measures for the cause of the treatment.