Whether a grinding glass density shadow on the lung that did not disappear on a three-month examination will disappear in the future should be analyzed in relation to the cause of the disease. If it is only a benign nodule, it can usually disappear, but if it is a malignant nodule, it is difficult to disappear. If the grinding glass density shadow on the lung belongs to benign nodule, it may be caused by pneumonia, pulmonary fibrosis, tuberculosis and so on. After timely and regular treatment, most of the patients can gradually disappear and the lung tissue will gradually return to normal. If the ground-glass density shadow on the lung is a malignant nodule, it usually will not disappear, and the nodule may exist for a long time, and will also gradually increase in size as the disease progresses. Ground glass nodules should follow the principle of early detection, early diagnosis and early treatment, so as not to delay the disease and cause malignant lesions. At present, if you find the existence of ground-glass density shadow, you should consult a doctor in time and under the guidance of a professional physician for regular treatment.