CT examination is the only way to detect small lung nodules With today’s advanced diagnostic equipment and medical technology, it is not difficult to detect lung cancer at an early stage and cure it completely, but the difficulty is that people generally lack the awareness of active medical examination, so that most lung cancer patients are already at an advanced stage once they are found, losing the best time for treatment. Early lung cancer is mainly manifested as asymptomatic small lung nodules. Nowadays, each unit will organize regular physical examination for employees every year, one of which is chest X-ray. Small lung nodules over 10mm need to be removed surgically. At present, advanced imaging examination can detect small nodules, which may have malignant tumor cells lurking in them, therefore, some people with nodules in their lungs are under great pressure, thinking that they may have lung cancer and must be cut up surgically. Not all lung nodules need to be removed surgically. Nodules of less than 4mm are clinically meaningless, nodules of 5 to 8mm are followed up once every six months, nodules of 8 to 10mm should be reviewed in three months, and if there is no change, the review time should be increased gradually and observed continuously for two years, while nodules of more than 10mm should be considered for surgery. Consider surgery. When it comes to chemotherapy, many people have the impression of nausea, vomiting and hair loss, but in fact, the new chemotherapy drugs have much less toxic side effects than the old ones, and even no hair loss. There is no problem for patients to adhere to 4 rounds of chemotherapy, and lung cancer treatment protocols also recommend patients who need chemotherapy to have 4 rounds of chemotherapy, more is not beneficial or even harmful. Of course, if the patient is a non-smoking woman and has adenocarcinoma, then there is a 60-70% chance that targeted therapy will be effective, but current data show that targeted therapy can only be superior to chemotherapy for patients with advanced disease. Considering the benefits and toxicities of chemotherapy, chemotherapy is not recommended for lung cancer patients over 75 years of age, and is recommended for lung cancer patients above stage IB the younger they are. Is smoking a major factor in the development of lung cancer? It can be said with certainty that smoking is the primary risk factor for lung cancer. For the sake of health, smokers are encouraged to quit smoking as early as possible. The decline in the incidence of lung cancer in the United States is due in large part to the government’s ongoing efforts to control smoking since the 1980s. In addition to smoking, various kinds of pollution should not be ignored, such as air pollution, including indoor decoration pollution, automobile exhaust pollution, barbecue food pollution, etc., which are also risk factors for lung cancer. Lung cancer may be related to environmental pollution, such as PM2.5, which is difficult to protect against and is directly inhaled into the deepest part of the lung tissue – the alveoli. Will CT examinations “eat” more radiation? Some people are worried about the problem of “eating lines” of CT examinations, ordinary CT examinations do eat a lot of lines, a CT examination is equivalent to 400 chest films, while low-dose CT examinations do not worry about eating lines, such as 64-row CT low-dose examination is only equivalent to 5 chest films, which is completely acceptable for health checkups. However, it is difficult to answer the question of whether non-smokers under the age of 50 should consider annual routine CT examinations. It should be considered in conjunction with other risk factors such as passive smoking, high pollution occupations, or family history. There are also health economics considerations in terms of policy.