Lung nodules 8 mm can be treated with surgery or observation and follow-up. It should be considered according to the nature of the nodule and the patient’s condition. 1. Surgery: When 8 mm nodule is found in lung examination, further examination such as enhanced CT or CT-guided percutaneous puncture for nodule biopsy should be performed. If malignant tumor cannot be excluded or diagnosed as malignant tumor, it is recommended that the patient should undergo surgical resection and be treated with radiotherapy and other modalities. 2. Observation and follow-up: If an 8 mm nodule is found in the lungs and assessed to be benign, and if the patient does not have obvious respiratory symptoms, such as coughing and sputum, then observation and follow-up can be chosen. If there is no change in the nodule on follow-up, observation can be continued. If the nodule is found to be enlarged, or if the patient develops chest pain, hemoptysis and other symptoms, it is necessary to further improve the relevant examinations, such as enhanced CT, bronchoscopy, etc., and choose the appropriate treatment according to the results of the examination. Patients should adjust their emotions, standardize their daily routine, avoid drinking, smoking and other bad habits, and exercise appropriately. It is recommended to go to the hospital to clarify the extent of the disease and then give targeted treatment.