A turbid sound on lung percussion is a sign of reduced air content in the lung tissue. A common cause of a turbid sound on percussion is pleural effusion, a large lung mass, pneumonia, etc. Lung percussion is a routine lung examination item. A normal percussion of the lungs is a clear sound, and a turbid sound is a non-musical percussion sound with a higher pitch, weaker sound and shorter vibration time. When the percussion is turbid, it indicates pathological changes in the lungs, which need to be combined with the presence of clinical symptoms such as coughing, coughing, chest tightness, fever, etc., imaging changes in the lungs, and blood sampling to find the cause of the disease and give appropriate treatment.