Lung nodules that have grown 1mm in a year are relatively mild if the diameter is less than 8mm, and relatively severe if it is greater than 8mm, requiring further pathologic examination and treatment in conjunction with the findings. If the lung nodule has grown 1mm in diameter compared to 1 year ago, the previous size needs to be referred to assess whether it is serious. If the diameter is less than 8mm 1 year ago, and there is a 1mm growth, the condition is relatively mild and should be reexamined and evaluated after 6-12 months. If the diameter was more than 8mm a year ago and there is an increase of 1mm on review, the condition is relatively serious. Prompt bronchoscopy and pathologic examination are needed to clarify the nature of the nodule, and at the same time, targeted treatment such as surgical resection should be taken. Therefore, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to carry out the relevant examinations, and follow the doctor’s instructions for treatment.