Many patients are fearful when they hear about a lung resection, worrying that they will have “bad breath” or “not enough breath” afterwards. What actually happens? The lungs are the respiratory organs of the body and their main function is to ensure ventilation and oxygenation of the body. A normal lung has a reserve function, that is, the amount of respiratory function that the lung can provide exceeds the amount of function that the body normally needs, cut off part of the lung tissue, the remaining lung tissue will play a compensatory role to make up for the missing lung tissue function, the overall impact on people’s daily life is not significant. Specifically, the right lung has 3 lobes and 10 lung segments, and the upper, middle and lower lobes of the right lung have 3, 2 and 5 lung segments respectively; the left lung has 2 lobes and 8 lung segments, and the upper and lower lobes have 4 lung segments each. For example, if one upper lobe of the right lung is cut off and 3 lung segments are missing, the loss of lung function accounts for about 30% of the right lung and about 15% of the whole lung ventilation function. After surgery, through the compensation of the remaining lung tissue, the amount of long-term ventilation function loss will be reduced by about half, which means that the loss of lung ventilation function will not exceed 8%. However, after surgery, some patients may experience chest discomfort of one kind or another due to the impact of the chest incision and intrathoracic adhesions, but with the popularization of minimally invasive surgery, the incidence of these sensations has been significantly reduced.