A few flocculent shadows in the lingual lobe of the left lung with poorly defined borders are usually considered to be an infectious lung lesion and can be treated with antibiotics and then reviewed. Most inflammatory lung diseases appear on CT in the form of lamellar, speckled, patchy, or scattered shadows of increased density with uniform or heterogeneous shading, and a few inflammatory lung diseases can appear as spherical lesions or even become ground-glass-like changes. The edges of most inflammatory lesions are not clear and smooth, and can have no clear boundaries. It can be evaluated in conjunction with other clinical findings and symptoms, such as blood sedimentation, c-reactive protein, routine blood tests, and the presence of cough, sputum, fever, chest tightness, shortness of breath, colds, runny nose, sneezing, throat discomfort, and other related symptoms. The lack of absorption after treatment with antibiotics needs to be considered as a possible viral or tuberculosis infection. Lung shadows should also pay attention to the possibility of fibroplastic foci, atypical hyperplastic foci and granulomas, etc. In the event of any of the above situations, go to the hospital in time to avoid delays.