There is no difference between hairy glass nodules and ground glass nodules, they are just two different names for the same pathological manifestation, which is mainly described by the morphology of the lung pathology found by taking X-rays, CT or MRI of both lungs. There are many common clinical causes such as serious infections caused by bacteria, Mycobacterium tuberculosis, fungi, etc. It is also seen in benign tumors such as malignant tumors and teratomas in the lungs, as well as stones and nodules with varying degrees of fibrosis and calcification in the lungs, and rarely in malignant tumors, all of which can show lung morphology, and the cause can be clarified clinically by taking biopsies of the nodules for pathological examination.