Frosted glass nodules in the upper lobe of the left lung are shadows of mildly increased density in the lungs, similar to the texture of frosted glass, that are found during a chest CT. Frosted glass nodules are associated with tumors, inflammation or dust accumulation in the lungs. 1. Tumor: Frosted glass nodules are also the early stage of lung cancer and have a better prognosis after systematic treatment. 2. Inflammation: Pneumonia may also show as glassy nodules in the lobes of the lungs, which will disappear after anti-infection treatment. 3. Accumulation of dust in the lungs: if too much inhaled dust is not discharged in time, it will be deposited in the interstitium of the lungs, and in serious cases, pneumoconiosis will be formed, and even lung fibrosis, which needs to be treated in regular hospitals in time. The specific cause of glass nodules in the lungs, need to go to the thoracic surgery clinic or respiratory clinic to do further examination to confirm the diagnosis, and then according to the condition of the corresponding treatment program. Do not seek treatment on your own to avoid delaying your condition.