At present, the most common pneumonia in the whole process of onset to recovery, mainly divided into four major pathological processes. Commonly, there is lobar pneumonia, which is divided into the congestion and edema stage, when the pathogen enters the mucosa of the lungs, causing its mucosa to appear obvious congestion and edema, with a small amount of inflammatory secretions oozing out. Then comes the red hepatoid phase, when the inflammation is further aggravated and there is rupture and hemorrhage of capillaries in the mucosa of the lungs. Continuing is the gray hepatoid phase, when the inflammatory response is more intense, with a large amount of inflammatory secretions oozing out, accompanied by purulent secretions containing a large number of neutrophils and macrophages, as well as dislodged tissue fragments and pathogens. Finally, there is the dissipation period, which is a period of gradual recovery of the inflammation. As the degree of congestion and edema of the airway mucosa decreases and the secretion decreases, the body temperature will gradually decrease, and the symptoms of coughing and sputum will gradually diminish until they disappear.