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Lung cancer is the most common primary malignant tumor of lung. Most lung cancer originates from the bronchial mucosal epithelium, so it is also called bronchial lung cancer. Lung cancer can spread around and even throughout the body. The distribution of lung cancer is more in the right lung than in the left lung, in the upper lobe than in the lower lobe, and cancer can occur from the main bronchus to the bronchioles. Originated from the main bronchus, bronchus lobar lung cancer, close to the hilum of the lung, known as central type lung cancer; Lung cancer originating below the bronchus of the lung segment, located in the surrounding part of the lung, known as peripheral lung cancer.