A 5-millimeter ground-glass nodule is not necessarily early lung cancer. When the diameter of the ground glass nodule is 5 mm, it only indicates that there is a lesion in the patient’s lungs, which may be caused by viral infection, mycoplasma or chlamydia infection, or lung cancer, etc., so it is not necessarily early lung cancer. Since the size of a 5-millimeter ground-glass nodule is still relatively small and does not require medical intervention, patients usually only need to go to the hospital for regular checkups to see if the nodule has increased in size or whether there is any abnormality in its shape. Therefore, when patients find that the diameter of ground-glass nodules is 5 mm, they should go to the hospital for chest enhancement CT, tumor markers, MRI, etc. If there is no dynamic change, they can go to the hospital for review at an interval of 3 months, and the subsequent review should be conducted regularly. If the subsequent nodules have increased in size or have abnormalities, it is necessary to actively improve the examination in the hospital to clearly diagnose the cause of the disease and carry out corresponding treatment and treatment under the guidance of the doctor.