Pneumonia may cause mixed density nodules, but does not exclude malignant lung nodules. 1. Pneumonia can cause mixed density nodules, which can be seen in bacterial, fungal, tuberculosis and other infectious pneumonias, and is usually seen mainly in people with a longer course of disease and relatively difficult treatment. 2. In addition to pneumonia, it is also necessary to be alert to the possibility of malignant nodules, and it is recommended that regular follow-up measures be taken according to the size of the nodules, and that timely medical treatment be provided, subject to the guidance of the doctor. When lung nodules appear, it is necessary to actively consult the doctor and follow the doctor’s instructions for reasonable treatment.