Ground glass density nodular shadow in the lower lobe of the left lung should be treated according to the cause of the disease. Ground glass density nodular shadow in the lower lobe of the left lung may be caused by inflammation, tuberculosis, tumor, etc. It can be treated with medication, surgery and radiotherapy. 1. Inflammation: Bacterial, fungal, viral and other microbial infections cause inflammatory reactions in the lungs, resulting in the appearance of ground-glass density nodular shadows. Bacterial pneumonia can be treated with oral antimicrobial drugs such as levofloxacin and amoxicillin; fungal pneumonia can be treated with antifungal drugs such as itraconazole and amphotericin B; viral pneumonia can be treated with antiviral drugs such as ribavirin and acyclovir. 2. Tuberculosis: Mycobacterium tuberculosis can also invade the lungs in the left lower lobe of the lungs with small nodular shadow of ground glass density, which can be treated with anti-tuberculosis drugs such as isoniazid, rifampicin and streptomycin. 3. Tumor: lung tumor foci are different in density from normal lung tissues, and glass density nodules can be seen in the lower lobe of the left lung in the imaging examination, which can be treated by surgical resection, and at the same time, radiotherapy, chemotherapy and other comprehensive therapeutic measures can be carried out. Patients with small nodules of ground-glass density in the lower lobe of the left lung should go to the hospital in time, complete the examination, and give targeted treatment after clarifying the cause of the disease. Drugs should be used under the guidance of a doctor, avoid self-medication.