Auscultation of pneumonia is also a criterion for the initial determination of pneumonia, and often wet rales can be heard during auscultation of a patient with pneumonia, or dry rales can be heard in some patients with severe infection. Wet rales are mainly due to the rupture of blisters formed by gas passing through the secretions in the airways during inspiration, so they are also called blister sounds. For patients who hear such rales during auscultation, it is necessary to further improve the lung imaging, which is the gold standard for the diagnosis of pneumonia, to determine whether the patient is infected with pneumonia.