Lung nodules of 7mm can be solid nodules, partially solid nodules or ground-glass nodules, and their follow-up time is different. 1. Solid nodules: 7mm solid nodules are usually followed up within 6 to 12 months, and if there is no change, they are referred to annual routine examination. If one or more risk factors for lung cancer are present (e.g., a long history of heavy smoking, family history of lung cancer, etc.), they are usually followed up within the first 3-6 months and then 9-12 months, and if there is no change, they are referred to annual routine checkups. 2. Partial solid nodules: For 7mm partial solid nodules, follow-up is usually required at the 3rd, 6th, 12th and 24th months, and if there is no change, it will be changed to regular annual examination. If the nodule becomes larger or more solid during the follow-up period, the possibility of malignancy is often considered. 3. Ground-glass nodule: For a 7mm nodule that is purely ground glass, the nodule can be followed up initially for 3 months, and if there is no change, the nodule will be transferred to the annual routine examination. It is recommended to go to a regular hospital for evaluation and judgment by a professional doctor to decide the specific follow-up time.