The difference between actual lung fire and deficiency lung fire is mainly in the fact that one is actual lung heat and the other is deficiency heat. Lung real heat is seen in acute upper respiratory tract infections, which manifest as coughing and coughing up sputum, mostly yellow sputum. In traditional Chinese medicine, yellow sputum is heat, spitting yellow sputum and the onset of the disease is more acute, and the acute onset of the disease is usually more likely to be caused by actual fire in the lung, such as acute colds and acute bronchitis, which are mostly caused by lung heat and wind heat. In addition to actual lung heat, sore throat and runny nose are also manifestations of actual lung fire. Identified by sputum and nasal discharge, it is real fire. Mainly, yellow nasal discharge is more pus, mostly accompanied by fever, which is equivalent to pneumonia in Western medicine. Lung deficiency fire is, as the name implies, yin deficiency fire. Yin deficiency fire of the lung often manifests as dry mouth and dry tongue, cough with little phlegm, or even phlegm with a small amount of blood. Therefore, lung deficiency fire is identified by sputum and secretions, which are less sputum and more viscous sputum in people with lung deficiency fire, along with a dry and painful throat. Some patients with pulmonary tuberculosis may even have coughing up blood or lungs coughing up blood in the sputum due to repeated attacks of lung heat, and in the later stages, lung yin deficiency is more important. Therefore, actual fire and deficiency fire can be identified by two aspects: actual lung fire, one is more urgent in onset, and the other is that the sputum is mostly yellow, and the patient is mostly accompanied by fever and sore throat, that is, the case of fire; deficiency fire of the lung generally has a longer duration of illness, and there will be recurrent coughing with a longer, slow onset of illness, which leads to deficiency of lung yin over time, mainly manifested as coughing up less sputum, coughing up sticky sputum, and less sputum is not easy to cough up, accompanied by dry mouth, dry tongue, and Dry and painful throat, especially at night.