Ground glass shadow in the lung may be pneumonia, ground glass shadow in the lung it is mainly caused by inflammatory lesions, early tumor lesions. Inflammatory lesions, such as tuberculosis, fungal infections, etc. Benign lesions can be cured by antifungal treatment and anti-tuberculosis treatment. A small number of ground glass shadows may be early lung cancer, and early lung cancer should be followed up and observed, which can be examined at three months or six months. Some inert ground glass shadows, which do not change even for one year, can be extended to one year for follow-up observation. If there is an increase in the density and size of the ground glass shadow, it indicates a high possibility of tumor, at this time, we should intervene and visit the hospital, or even do a puncture biopsy and perform thoracoscopic surgery for treatment.