There are more reasons for 14 mm ground glass nodule in the upper lobe of left lung, if inflammation and tuberculosis are considered, drug treatment is effective, if tumor is considered, it may be ineffective. 1. Inflammation: If there is a history of pneumonia before examination, and the nodule has clear boundaries without obvious burr or lobulation, inflammation may be considered, and oral antibiotics, such as moxifloxacin, may be prescribed. 2. Tuberculosis: if there is a history of contact with tuberculosis patients, and there is low fever, cough, emaciation, etc., the nodule is considered to be tuberculosis infection, and oral anti-tuberculosis drugs, such as rifampicin, can be taken as prescribed by the doctor. 3. Tumor: If the nodule is irregular in shape and has burrs, lobes, etc., consider that there may be a tumor, at this time, oral medication may be ineffective, and need to be evaluated by a surgeon to determine whether or not to carry out surgical treatment. If there is a ground-glass nodule in the upper lobe of the left lung, it is recommended to consult a doctor and actively cooperate with the treatment.