Lung fever is a term used in traditional Chinese medicine. Lung fever is also known as wind-temperature and lung fever, pneumonia, and pneumonia with wheezing and coughing. Corresponding to Western medicine, it is an acute inflammatory lesion of the lungs. Its causes are endogenous and exogenous infections. Endogenous infections are subdivided into primary endogenous infections, secondary endogenous infections, and bloodborne routes. Primary endogenous infections are caused by potentially pathogenic microorganisms such as Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, and Escherichia coli. Secondary endogenous infections are mainly due to Staphylococcus aureus. The hematogenous route refers to microorganisms that colonize the bronchopulmonary and rarely originate from the bloodstream. Exogenous infections include contact and airborne transmission, with contact being the most common mode of transmission. Pathogens are most commonly bacteria of the Pseudomonas and Legionella genera. Airborne dust can carry pathogenic bacteria and can be mobile, leading to the spread of pathogens such as Mycobacterium tuberculosis, Aspergillus and viruses. In summary, the causes of pulmonary fever are mainly infections with various pathogens, especially the common respiratory pathogens among them, including various conditionally pathogenic bacteria. For the prevention of lung fever, it is necessary to strengthen exercise, enhance immunity and prevent the feeling of external evils.