Left lung lower lobe distension insufficiency is mainly treated by the cause of the disease, including medication, radiotherapy, surgery, etc., and the use of medication should follow the doctor’s instructions. Lower lobe distensibility is usually detected during chest imaging and may be caused by inflammation or tumor. 1. Drug treatment: If there are elevated white blood cells, C-reactive protein, neutrophils, etc., inflammation is usually considered to be the cause, and broad-spectrum antibiotics, such as cefdinir, etc., should be applied, and antibiotics should be adjusted according to the results of drug sensitivity at any time. If caused by tuberculosis, receive regular anti-tuberculosis treatment, such as the use of streptomycin, rifampicin and so on. If there is lung atelectasis caused by lung cancer, anti-cancer treatment is the mainstay, such as radiotherapy, chemotherapy drugs such as cisplatin, etc. 2. Surgical treatment: if the lung atelectasis is caused by lung tumor, bronchoscopy or thoracoscopy should be performed to relieve the compression or blockage when necessary along with anti-cancer treatment. It is suggested that patients with left lung lower lobe atelectasis should go to the hospital in time to avoid delaying their condition.