Glassy nodular shadow of 6mm size in left lung may be related to lung inflammation, tuberculosis, lung tumor and other reasons. 1. Lung inflammation: glassy nodular shadow in the left lung may be caused by lung inflammation, due to bacterial or viral infection, inflammation in the lungs, stimulating the proliferation of lung interstitium, and the appearance of glassy nodular shadow. You can choose anti-inflammatory drugs, such as amoxicillin capsule, cefuroxime capsule and so on, under the guidance of the doctor. 2. Tuberculosis: mainly due to Mycobacterium tuberculosis infection, manifested by low fever, night sweats, etc., the lungs may appear glass nodule shadow 6mm in size, you can choose anti-tuberculosis drugs under the guidance of the doctor, such as isoniazid, rifampicin and other drugs for treatment. 3. Lung tumor: left lung glass nodule shadow may be benign tumor or malignant tumor, for 6mm nodule without discomfort symptoms and imaging did not see signs of malignancy such as burr sign, can be reviewed after 3 months chest CT, if discomfort symptoms or consider malignant, feasible puncture biopsy to clarify the nature of the nodule, such as the nodule review of the increase in size or the pathology of malignant line of surgical treatment. Glass nodules in the lungs, we should consult a doctor in a timely manner, do not blindly use drugs to avoid aggravating the symptoms or cover up the disease.