Wet rales are sounds produced by the rupture of blisters formed by gas passing through secretions such as exudate, sputum, blood, mucus and pus in the respiratory tract during inspiration, so they are also called blister sounds. Or it is thought to be the bursting sound produced by the wall of the small bronchus trapped and closed due to adhesion of secretions, which suddenly opens and re-inflates when inspiration is applied. Wet rales are one of the most important signs during auscultation of the lungs. The mechanism of formation is due to the presence of secretions (e.g., sputum, exudate, blood, mucus, pus, etc.) in the airways as the gas passes through them, resulting in the formation of blistering sounds, or the presence of fixed fine wet rales in the interscapular region mostly seen in pulmonary tuberculosis, etc. Large blistering sounds are common in comatose patients with severe bronchiectasis, tuberculosis cavitation, etc. Twisted hate sounds are seen in early tuberculosis early pneumonia, fibrous alveolitis pulmonary stasis, etc. It should be differentiated from abnormal lung auscultation sounds such as dry rales. They are characterized by intermittent and transient auscultation, often appearing more than once in succession, more pronounced during inspiration or at the end of inspiration, and sometimes also in early expiration. The location is constant, the nature is not easy to change, medium and small wet? The rales can exist simultaneously and can be reduced or disappear after coughing. Dry rales (wheezes, rhonchi) are sounds produced by turbulence during inhalation or exhalation of air due to narrowing or incomplete obstruction of the trachea, bronchi or fine bronchi.