The interval of lung nodule review should be analyzed according to the causes of lung nodule formation. The details are as follows: 1. If tumor-related lung nodules, for lung nodules caused by benign tumors, the review interval is usually 1-2 years; 2. If the possibility of malignant lung nodules cannot be ruled out, the corresponding review interval should be set according to the size of the nodules, for example, if the nodules are within 0.5 cm, the review interval should be once every three months or six months; 3. If the nodules are above 1 cm, the review interval is usually once every 1-2 months or three months. If the nodule is malignant, a long time interval will affect the patient’s treatment effect; 4. For infectious pulmonary nodules, the change is usually fast, especially when receiving treatment, the review time should be calculated on a weekly basis, once a week or a few days; 5. For immune-related pulmonary nodules, the review time is set according to the degree of disease progression. If the patient’s condition, in the stage of rapid change, the review time is relatively short, 1-2 months, if the patient’s condition after treatment or itself in a stable stage, the review time may be correspondingly extended, such as half a year or a year review.