Coughing up rust-colored sputum is an acute inflammatory disease involving most or all of the lobes of the lungs, mainly caused by Streptococcus pneumoniae, with diffuse fibrinous exudation in the alveoli. In addition to pneumococcus, L. pneumophila, S. aureus, Streptococcus hemolyticus, and Haemophilus influenzae can also cause lobar pneumonia. Cold, fatigue, intoxication, cold, and anesthesia can be triggers for lobar pneumonia. At this time, the defense function of the respiratory tract is weakened, the body resistance is lowered, and bacterial infections are easy to occur. Bacteria invade into the alveoli and multiply in them, especially the formation of plasma exudate is more conducive to bacterial reproduction, causing the metamorphic reaction of the lung tissues, the dilation of the capillaries in the interalveolar septa with increased permeability, and causing the bacteria to spread rapidly to the neighboring lung tissues through interalveolar foramina or the respiratory bronchioles, which can spread to the entire The interlobular spread is due to the spread of bacterial exudate through the lobar bronchioles.