If you have a cough, you should first distinguish between external and internal injuries. If you have an external cough, there are usually wind-cold, wind-heat, and wind-dry external sensations. To be on the safe side, if the cough is yellow phlegm, it is usually better to clear the lungs directly, but if it is thin white phlegm or if there is no phlegm coming out, it is recommended to first promote the lungs. Because the lung is the main surface of the skin and the lung orifices are on the top, so when the lung is declared, it can open the orifices, generate sweat, and drive the evil out, so that the disease can be controlled at the most superficial stage. If there is heat, such as yellow phlegm, fever or a very severe sore throat, it is time to clear the lung. This is because clearing the lung starts with clearing heat, from the organism to the whole body, not just sweat, but also pass the stool and urine, and phlegm can help lift the heat from the lung, which is definitely stronger than promoting the lung, and the impact will be greater.