Benign pulmonary nodules are not malignant, but the prerequisite must be a benign nodule. Nodules are not easily identified as benign or malignant in early stages, so dynamic follow-up chest CT is required. nodules are classified into 3 types: ground glass nodules, partially solid nodules and solid nodules. Nodules smaller than 5 mm are mostly benign nodules, which are chronic inflammatory changes with no clinical manifestations and do not require special treatment, and only require dynamic follow-up with high-resolution CT of the chest. The proliferative nodules formed after the cure of tuberculosis are also mostly benign nodules with stable lesions that do not require special treatment and are not prone to carcinogenesis. If the so-called benign nodules are larger than 6-8 mm with changes such as lobulated, short burr, pleural traction sign, pleural depression sign, etc., the possibility of early lung cancer needs to be alerted. Enhanced CT examination of the chest and percutaneous lung aspiration cytohistological biopsy if necessary are needed to avoid missed diagnosis and misdiagnosis. Therefore, benign nodules will not become malignant, and if they are pseudo-benign nodules, they need to be highly alert and dynamically followed up to avoid missed diagnosis and misdiagnosis.