Shortness of breath when walking depends on the population, the cause of shortness of breath, and the symptoms of the specific analysis. First of all, it depends on the population, if it is an elderly person, it is a normal physiological reaction to shortness of breath after activity or walking, probably due to ageing, declining lung function and not very good airway condition. If a young person has shortness of breath after activity or walking, we should pay attention to it, and shortness of breath after walking depends on the walking time, it is not normal to start shortness of breath after walking 50-60 meters, and it is normal to start shortness of breath after walking 10,000 steps, depending on how long the shortness of breath occurs after walking. Also determine whether there are other manifestations of shortness of breath, whether there is chest tightness, chest pain. If shortness of breath is accompanied by chest discomfort, especially chest tightness and chest pain in the anterior chest wall of the left chest, cardiovascular disorders may exist. If it always occurs frequently, it is recommended to go to the hospital for an electrocardiogram or cardiac enzyme test, or even a coronary CTA test, except if there is a manifestation of coronary heart disease. Another condition that can occur is post-activity shortness of breath, which can also occur with bronchitis or bronchial asthma. Post-activity shortness of breath sometimes also presents with wheezing sounds in the lungs, suggesting the presence of wheezing bronchitis or bronchial asthma. It is recommended to go to the hospital immediately to see the relevant respiratory physician for confirmation to see if there are croup or accompanying wheezing sounds in the lungs, and further medical comprehensive analysis should be done.