After getting lung cancer, a terrible disease, many patients do not know the common knowledge about lung cancer, which makes them have the misunderstanding that lung cancer is contagious to others and thus do not allow their family members to visit them. The following experts are invited to introduce this situation, is lung cancer contagious? Lung cancer is not a contagious disease, so the problem that patients worry about does not occur. Lung cancer is a highly malignant tumor disease at present. Lung cancer is a highly malignant tumor disease and must be treated promptly after the disease is detected. Because it can metastasize to different organs and cause corresponding symptoms, it can bring great pain to patients. In serious cases, it can be life-threatening. According to relevant research, cancer is not contagious in current clinical cases. Infection is simply the spread of a disease from a patient to an individual by some means. The three conditions of infection are: source of infection, transmission route and susceptible people, one of which is indispensable. Cancer cells in the patient’s body are a group of abnormal cells that are out of control and are infiltrating and growing. It not only destroys the adjacent normal tissues and organs, but also metastasizes to all parts of the body through lymphatic tract and blood circulation, and absorbs large amount of nutrients, grows and proliferates rapidly, leading to general failure of the patient until death. Is advanced lung cancer contagious? We all think that “lung disease” is contagious, and this “lung disease” is tuberculosis. Patients suffering from tuberculosis are called open tuberculosis when they have positive sputum bacteria, and they are contagious, so patients who cough and cough with blood in their sputum should pay attention to prevention. Unlike tuberculosis, lung cancer is a malignant tumor that is caused by abnormal proliferation of local cells and loss of normal cell shape and dynamics under the effect of many different carcinogenic factors. Cancer is not contagious to other people under normal circumstances. For what people call infectious diseases, there are conditions for transmission, including the source of infection, transmission route and susceptible people, and only when these conditions must exist will it be transmitted to others. Many people have very little knowledge about lung cancer, and some even think that lung cancer is also contagious. Most people think that tuberculosis is lung cancer, however, there is a difference because lung cancer is not contagious.