Pneumonia may suddenly appear as a ground glass nodule. Lung ground glass nodules are findings on chest imaging that may be due to pathogenic infections, local bleeding, and early tumors. When a patient’s lungs are attacked by a variety of pathogens, such as bacteria, fungi, viruses, or atypical pathogens, they are prone to inflammatory lesions leading to pneumonia. Inflammatory lesions may be large solid lesions, small flaky shadows, or localized round-like ground-glass nodules, among many other forms. The sudden appearance of ground-glass nodules caused by pneumonia can be absorbed and disappear after systematic and standardized treatment, but if the ground-glass nodules persist and gradually increase in size, it is necessary to pay attention to the possibility of malignant tumors in the early stage. If you have ground-glass nodules in your lungs, you should go to the hospital in time to avoid delaying your condition.