Shortness of breath can occur in normal people who do heavy work, because heavy work can lead to a significant increase in heart rate, myocardial oxygen consumption and shortness of breath, which can cause clinical symptoms of shortness of breath, which can improve after rest. If shortness of breath or a significant decrease in exercise tolerance compared to the previous one occurs after doing some non-heavy work, related diseases may occur, the most common diseases are cardiopulmonary diseases such as chronic obstructive pulmonary emphysema, heart failure caused by various reasons, etc. In addition, anemia, hyperthyroidism, etc. may also cause symptoms of shortness of breath after working a little. If there is a significant decrease in exercise tolerance or shortness of breath after working a little, the patient should go to the hospital as soon as possible to improve the relevant examination to further clarify the cause for active treatment.