In most cases, one-third of the left lung can be removed for manual labor, but if lung function is poor, heavy labor is not recommended despite removal of one-third of the left lung. The lungs have five lobes, two on the left and three on the right. In most cases, if there is no obvious abnormality in the overall lung function, the removal of one-third of the left lung due to localized lung disease usually does not affect the overall lung function and body function. Therefore, one-third of the left lung can do manual labor after resection. However, if the overall function of the lungs is poor and there is degeneration or lesions in the overall structure of the lungs, heavy physical labor is not recommended despite the removal of one-third of the left lung. This is because heavy labor may cause further damage to the lung function and affect the health of the body.