Lung cancer is a malignant tumor disease with increasing incidence in recent years. The high incidence of lung cancer greatly threatens the life and health of patients, therefore, we should actively prevent and treat lung cancer effectively and learn more about lung cancer to be prepared for it. Early to late stage lung cancer is a process of disease development, so how long does it take is a concern of patients. First of all, lung cancer is broadly divided into central and peripheral types, and tissue-wise it is divided into different types such as squamous cell carcinoma, adenocarcinoma, hypofractionated carcinoma, oat cell carcinoma, alveolar cell carcinoma and undifferentiated carcinoma. Secondly, the physical condition and immunity of each person are different, so its development speed is also different, ranging from 40 days to several years. At present, nearly 60% of lung cancer patients are already in advanced stage when they discover their symptoms. This has a lot to do with the lack of medical knowledge and poor self-protection awareness. Usually, patients with no symptoms rarely go to hospitals for examination, and some of them even carry on with their symptoms in the hope that they can be cured by themselves. Secondly, surgical resection often cannot solve the fundamental problem, because cancer cells will metastasize and most of the operated patients will recur later, which is the reason why many patients are willing to give up the treatment. This is the reason why many patients are willing to give up the treatment. Today, we have introduced the content of early to late stage of lung cancer to you, and I think you have some simple understanding of it now. Although lung cancer is a very serious disease, as long as patients are detected and treated early, with the current medical technology, it can be effectively controlled and reduce patients’ pain.