Shortness of breath when walking is often seen in lung diseases and cardiovascular diseases, for the following reasons: 1, lung diseases, often seen in chronic obstructive pulmonary disease, bronchial asthma, pneumonia, tuberculosis and other diseases. The shortness of breath and shortness of breath should be treated with antispasmodic and asthma treatment, such as doxorubicin and montelukast. 2, cardiovascular diseases, such as coronary heart disease, cardiomyopathy, rheumatic heart disease, etc., resulting in cardiac insufficiency, can also occur when the activity of chest tightness, shortness of breath, shortness of breath, often need to give diuretic, cardiac, vasodilator treatment. 3, moderate to severe anemia can also cause activity Shortness of breath and shortness of breath during activity can also cause shortness of breath, which requires blood transfusion and treatment for the cause of anemia.