There is no exact clinical value for how long it takes for a microscopic nodule to become a small nodule, but it is mainly related to the nature of the microscopic nodule and the individual factors of the patient. If the nodule is mainly an inflammatory growth, it is usually a benign lesion and grows slowly, and the patient is advised to review the CT after 3 months; if the change is not significant, it usually has no effect on the body and can be reviewed every 6 months thereafter. If the patient’s CT is reviewed after 3 months, it indicates that the nodule has increased significantly, then it is considered as malignant nodule. Malignant nodule usually grows faster and can become small nodule or develop into large nodule rapidly within a short period of time, which can be life-threatening in serious cases. In daily life, patients should pay attention to keep warm, avoid cold and flu, and do aerobic exercise and strengthen nutrition to enhance their physical fitness.