Running for a while on the breathlessness more than consider the lack of exercise, heart or lung insufficiency, so should strengthen the exercise or timely examination of cardiopulmonary function. 1. Lack of exercise: often do not exercise people, after strenuous exercise will appear shortness of breath or even dyspnea, most of the body for the performance of the decline in exercise tolerance. Adhere to exercise for a few days, the general symptoms can be improved. 2. Cardiac and pulmonary insufficiency: when suffering from myocardial ischemia, cardiac valvular disease, bronchitis, asthma and other underlying diseases, the heart pumping capacity or lung ventilation function decline. Therefore, it can not withstand strenuous exercise, the performance of breathlessness. For this kind of people should avoid strenuous exercise, timely to the regular hospital, clear cause, timely treatment. Therefore, running breathlessness first clear with or without underlying diseases, in determining the cardiopulmonary organs without organic lesions on the basis of more exercise, the symptoms can be improved.