Lung cancer is not contagious in advanced stage. Lung cancer is not contagious. Although the condition of advanced lung cancer is relatively serious, lung cancer is not a contagious disease, so it is not contagious to normal people. Lung cancer is mainly caused by its own factors, even if normal people come into contact with the saliva or clothes of patients with advanced lung cancer, which have cancer cells, they will be cleared by the immune system of normal people in time, and will not be able to reproduce and grow in normal people’s body, so there is no need to worry about being infected by patients with advanced lung cancer at all. However, it should be noted that some lung cancer patients have pneumonia or tuberculosis at the same time, which can be infectious, so it is necessary to clarify whether there are other secondary diseases in patients with advanced lung cancer, and if there are such diseases, they should take good protective measures in the process of contacting to avoid infecting other diseases.