A ground glass nodule of eight millimeters does not necessarily require an operation. Most of the ground glass nodules are seen in inflammation, allergy, tuberculosis, tumor and other diseases. If malignant tumor is considered, an incision is required, and after the incision, depending on the pathology, we will see if further treatment is needed. If tuberculosis is considered, no incision is needed and anti-TB treatment is available and the lesion can be absorbed. If the disease is allergic, the prognosis is good if the allergic reaction is removed and anti-allergic treatment is given if necessary, and surgery is not required. If inflammation is considered, anti-inflammatory treatment is given and the lesion can be absorbed, or in some cases, it can be absorbed on its own, so incision is also not needed. In conclusion, an eight millimeter glass nodule should be treated surgically if it is considered malignant, but not necessarily if it is considered other diseases.