Whether the total fever in advanced lung cancer is bad or not needs to be analyzed specifically according to the patient’s specific situation, and there are more factors that are bad. Total fever in advanced stage of lung cancer needs to be identified as soon as possible whether the fever is cancer fever or infectious fever. Because repeated fever may easily lead to progressive failure of the body and various complications that endanger life. If the fever is determined to be cancerous, hormones or non-steroidal drugs should be given to control the body temperature as soon as possible to reduce the nutritional consumption of the patient. If it is infectious fever, imaging examination as well as blood biochemical examination should be performed to understand whether it is obstructive pneumonia or pulmonary atelectasis caused by central lung cancer. If the infection is more serious, anti-infection treatment needs to be given as soon as possible to control the symptoms of pneumonia infection and control the body temperature to reduce the patient’s consumption. In conclusion, in the advanced stage of lung cancer, either cancer fever or infectious fever is not good, which can easily make patients show progressive failure, shorten their life span and endanger their lives.