Primary bronchopulmonary cancer, referred to as lung cancer, originates from the bronchial mucosa or glands and is the most common primary malignant tumor of the lung. The clinical symptoms are insidious, with cough, sputum, hemoptysis, and wasting as the main manifestations. The pathogenesis of lung cancer is related to the following factors: smoking, air pollution, occupational carcinogenic factors, ionizing radiation, diet and physical activity, genetic factors, etc. Infectious disease is a contagious disease produced by pathogens (viruses, rickettsia, bacteria, spirochetes, etc.) that infect the human body. Lung cancer is not contagious.
Epidemiological surveys have found that liver cancer itself is not infectious, but it is somewhat hereditary. If liver cancer is caused by a virus, such as hepatitis B or C, this may be contagious, but it is not the contagiousness of the cancer, but the contagiousness of viral hepatitis itself. Generally, hepatitis is transmitted through blood transmission, which is caused by broken mouth contact. There is also some transmission through body fluids, including saliva, semen, and sweat, but it is not particularly clear now. Generally, when patients take blood or dispose of waste bodily fluids, they should not throw them away freely to avoid transmission by other people. The main cause of liver cancer in our country is viral hepatitis infection, mainly hepatitis B and C. Aflatoxin contamination in food and drinking water contamination in rural areas are other factors such as alcohol consumption, smoking and genetic factors.