Mixed glass nodules are generally not serious if they are caused by pneumonia or tuberculosis, but relatively serious if they belong to lung cancer. 1. Pneumonia: Pneumonia is often related to bacterial and viral infections, in which the lung tissues are repeatedly stimulated by pathogenic bacteria, leading to the exudation of inflammatory substances, which may form mixed ground-glass nodules after the exuded substances are mechanized. This condition is generally not serious and can be cured through timely treatment. 2. Tuberculosis: This disease is mainly caused by infection with tuberculosis bacillus, which may form mixed ground glass nodules after repeated stimulation of lung tissue. The prognosis of this disease is good, and it can be cured through timely treatment, but the course of the disease is longer. 3. Lung cancer: belonging to malignant tumor of lung tissue, mixed ground-glass nodules may exist in the early stage of lung cancer, accompanied by uneven density inside the nodules and burrs at the edge. The disease is relatively serious and may be life-threatening if not effectively treated. If mixed ground-glass nodules are found in the examination, it is recommended to go to the hospital in time and actively diagnose and treat the disease, so as to avoid delaying the condition.