Left upper lobe ground glass nodule is a nodular focus of ground glass density in the upper lobe of the left lung. Left upper lobe ground glass nodule is usually malignant if the density of the ground glass shadow is high, and may be benign if the density of the ground glass shadow is low. Left upper lobe of the lung grinding glass nodule manifested as a mild increase in density, but within the bronchial vascular bundles are still visible, such a grinding glass density shadow formed by the nodular foci, when the grinding glass shadow density is high, usually nodular tissue component is more, the situation may be malignant. Low density of ground glass shadow of ground glass nodule in the upper lobe of the left lung, the vast majority of inflammation, hyperplasia and other lesions caused by the nodule, generally benign. The lighter the grinding glass shadow, the better, the denser it is, the worse it is, because the denser it is, the more tissue it contains. Patients with ground glass nodules in the upper lobe of the left lung who are diagnosed as malignant are recommended to undergo surgical resection under the guidance of a doctor, and after the surgery, they should strengthen exercise to enhance immunity and avoid recurrence.