Nowadays, the incidence of lung cancer is very high, and many people are suffering from lung cancer disease, because we all understand that lung cancer disease is very serious, and it is very difficult to treat after patients. If we want to avoid the harm of lung cancer, we need to actively prevent lung cancer, so what are the causes of lung cancer? Let’s find out together! First of all, we cannot rule out the internal causes of lung cancer, maybe there are genes in our body that cause lung cancer, such as family genes, as well as lowered immune function, metabolic activities, endocrine dysfunction, etc. may also play a role in the development of lung cancer. Smoking is the most common factor, and the longer the smoking age, the greater the chance of lung cancer, so we should actively quit smoking. The increase in the incidence of lung cancer is parallel to the increase in the sale of paper cigarettes, which contain many carcinogenic substances such as benzo(a)pyrene. Long-term smoking can lead to bronchial mucosa epithelial cell hyperplasia and phosphoepithelial growth, inducing squamous epithelial cancer or undifferentiated small cell carcinoma. Atmospheric pollution and the rapid development of industry nowadays, but the pollution in big cities is also very serious, so the chance of lung cancer in a long time living in a serious pollution environment will be greatly increased. The high incidence of lung cancer in industrially developed countries, higher in urban than rural areas, and higher in factories and mines than in residential areas, is mainly due to the pollution of the atmosphere by harmful substances such as benzo(a)pyrene carcinogenic hydrocarbons produced by burning oil, coal, internal combustion engines and asphalt road dust in industrial and transportation developed areas. Chronic lung diseases such as tuberculosis, silicosis and pneumoconiosis can coexist with lung cancer. The incidence of cancer in these cases is higher than that of normal people. In addition, chronic inflammation of lung bronchus and lung fiber scar lesions may cause squamous epithelial chemosis or hyperplasia during the healing process, on the basis of which, some cases may develop into cancer. Occupational factors After years of investigation and research, it is now recognized that long-term exposure to radioactive substances such as uranium, iron, asbestos, arsenic, radium and their derivatives, chromium, asphalt, coal tar, petroleum, carcinogenic hydrocarbons, tin, nickel, mustard gas and copper can induce lung cancer, mainly squamous and undifferentiated small cell carcinoma.