Pulmonary ground glass nodule shadow is a pathological change found on chest imaging. The presence of pulmonary ground glass nodules requires careful observation of the size, number, and nature of the nodules. If the pulmonary ground glass nodules are less than 5mm or less than 3mm, they are mostly benign and do not require special treatment, and only require 1-year follow-up with a high-resolution CT of the chest. If the pulmonary ground glass nodule is between 6-8 mm and is a growing nodule, it is still necessary to be alert for the possibility of early cancer. If the pulmonary ground glass nodule is larger than 8mm, accompanied by short burr, lobar, pleural pulling sign, pleural depression sign, or clinical symptoms, such as cough, coughing sputum, or even blood in sputum, a chest enhancement CT should be performed for further clarification to exclude whether it is early lung cancer and ask the thoracic surgeon for early surgical intervention and treatment. Most of the ground glass nodules in the lung have inflammatory changes. If they show growth changes and develop into partially solid nodules and solid nodules, you need to be highly alert to whether they are malignant tumors in the lung.