An 8mm sized nodule in the lung is not necessarily cancer, but it should be reviewed regularly. Early stage lung cancer does manifest as small nodules in the lung, but there are many benign diseases, such as tuberculosis ball in the lung, fungal infection in the lung, lung malformation tumor, etc., which can also lead to the appearance of small nodules in the lung, so small nodules in the lung cannot be equated with lung cancer. If a nodule of 8mm in diameter is found in the lung, the correct approach is to carefully observe the shape of the nodule. If the shape is regular and the boundary is clear, benign disease is more likely; on the contrary, if the shape is irregular, the boundary is unclear or even has burrs, we should be alert to the possibility of malignancy. The growth rate of the nodules should also be looked at. If the nodules are getting larger and rapidly increasing in size, cancer is a possibility, while if the nodules are basically the same size or growing slowly, benign lesions are more likely. For example, the concentration of tumor markers in the patient’s blood, including carcinoembryonic antigen, SCC, CY211, NSE, etc., should be checked, and cancer should be ruled out if it is found to be significantly elevated. The most accurate means of identification is surgical resection or puncture to remove the nodules for pathological examination, but experts agree that for small lung nodules less than or equal to 8 mm, do not rush to surgery or puncture, but give some time for observation and follow-up.