Patchy blurred shadows are the descriptive language of imaging and can be due to a variety of etiologies. For example, infectious diseases of the lungs, and non-infectious diseases. The most common infectious diseases are exudative changes in the lungs due to bacterial or viral infections, fungal infections, tuberculosis infections, mycoplasma infections, legionella infections, etc. These patients should be treated with aggressive and effective anti-infective therapy. In some cases, it can progress to severe pneumonia, and the blurring of the lung patches should be closely observed. It is also necessary to consider some non-infectious diseases, such as interstitial lung disease and malignant tumors.