Lung cancer is generally divided into small cell lung cancer, non-small cell lung cancer, and non-small cell lung cancer includes squamous carcinoma, adenocarcinoma of the lung, and other large cell carcinomas. The disease spectrum of lung cancer has recently changed, with squamous carcinoma predominating in the past and lung adenocarcinoma now surpassing squamous carcinoma. Adenocarcinoma of the lung develops step by step and can spread through the airways. The human lung consists of hundreds of millions of alveoli and adenocarcinoma is the spread of cancer cells through the alveolar pores via air exchange. There is a theory that multiple lung cancers are found to be caused by airway dissemination, so it needs to be taken seriously by specialists and the general public. Since all people have to breathe, the lesions need to be dealt with in the bud, the earlier the better.