The presence of ground-glass density shadows in the lower lobes of the lungs is not serious if it is caused by benign inflammation or leakage of body fluids. However, if it is caused by tumor proliferation, it is a more serious case and needs to be judged according to the specific cause. 1. Benign lesions: there are more reasons for the appearance of ground-glass density shadows in the lower lobes of the lungs. If there are fungal and bacterial infections in the lung tissues in the short term, which cause inflammation and lung tissue damage, it will lead to the appearance of ground-glass density shadow on the imaging. At the same time, mild pulmonary edema or localized alveolar injury can also lead to such results, but they are all benign lesions that do not cause great damage to the body. 2. Malignant lesions: the ground-glass densities in the lower lobes of some lungs may be the imaging changes caused by the proliferation of lung tumors. If the tumor itself belongs to malignant differentiated tumors, the damage caused to the body is more serious, and it is a more urgent disease, so it needs to be treated by surgery or radiotherapy as soon as possible in order to protect the health of the body. After the appearance of the lower lobe of the lung grinding glass density shadow, the specific cause of the disease should be determined as soon as possible, so as to choose the appropriate treatment plan.