Pneumonia sputum depends on the specific situation, for example, pneumonia patients with more sputum and purulent sputum, more suggest that the patient’s degree of infection is more serious, need active anti-infection treatment. If the sputum gradually increases during the treatment of pneumonia, the white mucous sputum becomes purulent sputum, or the nature of the sputum changes and there is blood in the sputum, this is a sign that the lung infection is not effectively controlled and the degree of infection is gradually aggravated. If a patient with pneumonia has a lot of sputum, but the sputum changes from purulent sputum to white mucous sputum and is easy to cough up, and the patient’s clinical symptoms are improving, it indicates that the degree of lung infection has been controlled and improved, because when the lung inflammation is controlled, the ciliary movement of the airway mucosa will be enhanced and the sputum will be better expelled.