Lung cancer belongs to a kind of malignant tumor of the respiratory system. Before dying, some patients will show a slight improvement in their physical state, for example, they used to have chest pain, dyspnea and chest tightness, and these symptoms may disappear before dying, but ultimately, there is no way to reverse the condition, and it will also gradually worsen and lead to death. This kind of is said by some people in the folklore to be the return of the light, in fact, there are such cases. It is believed that it may be due to the change of hormone secretion level in the patient’s body before death, such as the increase of adrenaline secretion, resulting in a period of time, usually a relatively short period of time, in which the patient may improve but not for a long period of time. Advanced stage of lung cancer should try to reduce the pain and prolong the survival period, and can apply the drugs of nutritional support, as well as the strong pain-relieving drugs and so on.