Pulmonary nodules are a description or diagnosis belonging to imaging for many specific reasons, such as infection, tuberculosis, connective tissue disease, tumors, etc. Pulmonary nodule fibrosis is often a benign lesion in lung nodules that is not completely absorbed and replaced by fibrous scar tissue after the infectious disease has improved, and generally does not change during long-term observation. Patients usually pay attention to diet, ensure a light diet, avoid spicy stimulation, quit smoking and alcohol, exercise reasonably, maintain lung function, and regularly review chest CT to observe changes in nodules.