Shortness of breath is mainly caused by the following reasons: 1, common is to exclude respiratory diseases, if the shortness of breath, shortness of breath, longer and accompanied by coughing and coughing up sputum, then we should consider to exclude chronic bronchitis, emphysema, pulmonary heart disease, etc., it is recommended to improve the chest CT, pulmonary function tests, a clear diagnosis. 2, shortness of breath, shortness of breath, if accompanied by swelling of the lower extremities, shortness of breath after activity significantly aggravated and accompanied by the symptoms of heart failure, nocturnal dyspnea, sleep at night can not lie down. If it is accompanied by double lower limbs swelling, asthma after activity, and accompanied by paroxysmal dyspnea at night, sleep at night can’t lie down and other symptoms are to be considered to exclude heart failure. Especially for patients with hypertension, diabetes, it is recommended to improve the cardiac ultrasound, heart rate examination, a clear diagnosis. 3, shortness of breath, shortness of breath, if in the exclusion of cardiopulmonary diseases, occurring in the patient’s emotional tension, this time to consider when emotional excitement, anxiety, etc. caused.