Nodules on the lungs are mostly detected by chest X-ray and chest CT, suggesting chronic inflammatory infections on the lungs, but also depending on the size and nature of the nodule to determine the degree of benignity and malignancy. Pulmonary nodules are classified as ground glass nodules, partially solid nodules and solid nodules. Ground glass nodules less than 5 mm are mostly benign lesions and can be observed dynamically. If the nodule is between 6-8mm, it needs dynamic follow-up. If it is larger than 8mm, it needs to be paid high attention, especially if it is accompanied by lobar, short burr, pleural pulling sign, pleural depression sign, etc., it should be alerted to the possibility of early lung cancer. If supraglottic nodular shadow occurs in the upper lung, it also indicates that the patient has been infected with tuberculosis in the past and formed nodular changes in the process of absorption, which is mostly benign. However, if the nodule is larger than 3 cm, it should be alerted to the possibility of transformation of the tuberculosis lesion into lung cancer, and enhanced chest CT and percutaneous lung aspiration biopsy should be performed to clarify whether malignant changes have occurred as soon as possible.