The cause of tuberculosis left lung all white may be caused by left-sided tuberculous pleural effusion, tuberculosis infection aggravation caused by the left lung atelectasis. 1. Tuberculous pleural effusion: left lung infection with Mycobacterium tuberculosis can cause tuberculous pleurisy, resulting in imaging manifestations of the left side of the white lungs, the need for closed chest drainage to drain the pleural fluid and anti-tuberculosis treatment. 2. Left lung atelectasis: aggravation of tuberculosis infection can cause left lung atelectasis, and cause structural changes in the lung causing lung destruction on chest radiographs or CT showing white lungs, requiring standardized anti-tuberculosis treatment and nutritional supportive therapy and other comprehensive treatment. It is recommended to consult a doctor in time for the treatment of left lung whitening in tuberculosis under the guidance of a specialist.