Lung cancer

Lung cancer occurs in the bronchial mucosa or glands, also known as bronchial lung cancer. In the past 50 years, many countries have reported a significant increase in the incidence of lung cancer. Among male cancer patients, lung cancer has ranked first, and the incidence of women has also increased rapidly, accounting for the second or third most common malignant tumor in women. The incidence rate for males and females is 3 ~ 5 ﹕ 1, and the age of onset is mostly 60-79 years. The cause of lung cancer is not completely clear so far, and a lot of data show that long-term heavy smoking is an important cause of lung cancer. For people who smoke more than 40 cigarettes per day for many years, the incidence of lung squamous cell carcinoma and undifferentiated cancer is 4-10 times higher than that of non-smokers. The incidence of lung cancer is higher in urban residents than in rural areas, which may be related to air pollution and carcinogens in smoke and dust. Therefore, non-smoking should be promoted and urban environmental sanitation work should be strengthened.