Pulmonary nodules with ground glass shadow are inflammatory changes in the lung, but we should also be alert to the possibility of early lung cancer with ground glass nodules in the lung, the key to judgment is mainly the size and nature of the ground glass shadow. If the size of pulmonary nodules with ground glass shadow is less than 5mm or about 3mm, it is called microscopic lung nodules, which are mostly benign and do not need special treatment, and it is recommended to follow up with high-resolution CT of the chest once a year. If pulmonary nodules with ground glass shadow between 6-8mm, accompanied by short burrs, lobulation, pleural traction sign, pleural depression sign, etc., along with clinical blood in sputum and progressive wasting. At this time, we should be alert to the possibility of malignant lesions, and perform enhanced CT examination of the chest as soon as possible to see if the lesions are enhanced. If the pulmonary nodule with ground glass shadow larger than 8mm and progressive growth, accompanied by typical clinical manifestations, such as chest pain, blood in sputum, wasting, and significantly increased biochemical tumor markers, the diagnosis of lung cancer can be considered, and a thoracic surgeon should be consulted to perform minimally invasive surgery to remove the lesion as soon as possible.