Shortness of breath after walking is a clinical manifestation of dyspnea, which can have many causes. The more common ones are respiratory diseases, which trigger exercise asthma due to the hyper-responsive state of the airways after walking. In addition, the patient’s chronic inflammatory lesions, such as chronic wheezing bronchitis, chronic obstructive emphysema, chronic pulmonary heart disease will walk for a period of time, due to the patient’s cardiopulmonary function is relatively poor easily lead to relative hypoxia state and cause shortness of breath. It is also seen in diseases of the cardiovascular system, where pulmonary edema results from left heart failure due to a variety of causes.