A 13mm lung nodule is not necessarily an early stage lung cancer and requires other tests to further identify it. 13mm lung nodule is not necessarily early stage lung cancer, because there are many types of lung nodules, it can also be inflammation, tuberculosis infection, but the nodules that consider malignant lesions in lung tissues belong to lung cancer. Therefore, you cannot judge whether a lung nodule is benign or malignant simply based on the size of the nodule. You can do a chest CT to see the morphology of the lung nodule, and do a lung puncture biopsy for pathology to confirm the diagnosis. If the lung nodule is 13mm in size, if it is benign, there is no need for special treatment, and regular checkups every three months will be enough, but if it is malignant, timely surgery is needed, and the specific treatment should be based on the doctor’s advice. It is recommended to do a good job of medical checkups, and if there is any abnormality, you should consult a doctor in time to avoid delaying your condition.