Lobar pneumonia, also known as pneumococcal pneumonia, is an acute inflammatory disease of the lungs with a lobar distribution caused by bacterial infections such as S. pneumoniae. Common causes include exposure to cold, exertion or rain. It is an acute inflammatory disease of the lung parenchyma caused by S. pneumoniae. It occurs in young and strong males and during winter and spring. Common causes include exposure to cold, rain, intoxication or general anesthesia after surgery, and sedation overdose. The main pathological changes are exudative inflammation and solid changes of the alveoli. Clinical symptoms include sudden chills, high fever, cough, chest pain, and coughing of rust-colored sputum. Coughing rust-colored sputum is mainly caused by Streptococcus pneumoniae as an acute inflammatory disease involving most or all of the large lobes of the lung, with diffuse fibrinous exudation in the alveoli. In addition to Streptococcus pneumoniae, S. pneumoniae, Staphylococcus aureus, Streptococcus haemolyticus, and Haemophilus influenzae can also cause lobar pneumonia. The defense function of the respiratory tract is weakened, the resistance of the organism is reduced, and bacterial infection easily occurs. Bacteria invade into the alveoli and multiply within them, especially the formation of plasmacytic exudate is more conducive to bacterial multiplication, causing a metamorphic reaction in the lung tissue, an increase in the permeability of the alveolar interstitial capillary expansion, and the rapid spread of bacteria through the interstitial pores or respiratory bronchi to the adjacent lung tissue, thus spreading to the entire lobes, and in The interlobular spread is caused by the spread of bacterial exudate through the lobar bronchi.