If the pulmonary ground glass nodule is inflammatory, the exact time when it disappears needs to be determined by the nature of the inflammation. If the inflammation is a common infection including viral, bacterial, mycoplasma, chlamydia, etc., after standardized anti-infection treatment, a review of chest imaging in about two weeks can indicate the disappearance of the hairy glass nodules in the chest. If the inflammation is early malignancy, especially the ground glass nodules larger than 8mm, the inflammation is similar to common infection in early stage, and the nodules not only do not disappear after anti-infection treatment, but may become growing nodule changes, such as with short burr, lobulated, pleural traction sign, pleural depression sign nodules have occurred early lung cancer, even if anti-inflammatory and anti-infection treatment is given, they still will not disappear. Further high-resolution CT of chest, enhanced CT of chest, percutaneous lung aspiration for cytology if necessary, or early surgical resection by a thoracic surgeon are needed to treat the inflammation.