Faint density of ground glass nodules is usually not a good thing, there may be lung inflammation, lung tuberculosis and lung tumors, etc., and the cause of the disease should be identified in a timely manner. 1. Lung inflammation: when the organism is infected by mycoplasma, chlamydia or virus, it will lead to inflammation in the lungs, with changes in the degree of alveolar inflation and exudation of osmotic fluid; when the organism is infected by bacteria, there will be inflammatory reaction to make the airways blocked, which will lead to abnormal osmotic material in some of the alveoli, and make the surface of the lungs appear as a cloud, resulting in the situation of pale density of ground-glass nodules. 2. Lung tuberculosis: Mycobacterium tuberculosis is the main cause of lung tuberculosis, which will cause the alveoli to be inflated to different degrees, and there will be fluid exudation, which will lead to the formation of glassy nodules with pale density on CT. 3. Lung tumor: Early lung tumor will make the lungs show cloudy lesions, which will result in pale density of ground-glass nodules. If the density of ground-glass nodules is pale, the next examination should be carried out in time to clarify the specific cause of the disease, so as to avoid delaying the condition.