6mm Lung nodule disappeared on imaging one year later, indicating that the lung nodule was a benign nodule that healed on its own or was absorbed after medication. Benign lung nodule is caused by calcification of the tissue of the lesion after treatment of tuberculosis, fungal infection, bacterial infection and other diseases, which is shown after imaging examination, and thereafter the benign lung nodule gradually becomes smaller in size under the phagocytosis of the macrophage system in the lungs until it disappears. If the patient is worried, he can go to the respiratory medicine department or thoracic surgery department of the local hospital, and under the guidance of the specialized doctors, improve the relevant examinations, such as chest CT and MRI, to clarify whether there are still lung nodules, and then follow up regularly to closely detect the changes in the lung imaging. Patients should not be overly alarmed, and should follow the doctor’s instructions to recuperate after the follow-up examination, and pay attention to smoking cessation and prevention of lung infections.