If the frequency of coughing increases, the amount of hemoptysis increases, chest pain worsens, shortness of breath becomes stronger, and there is also weight loss, high attention must be paid to it. For lung cancer patients, even a delay of two or three months in treatment may seriously affect the prognosis. Therefore, it is recommended that elderly people should have a routine physical examination once a year, including chest plain film or CT examination, etc. Many people worry that these imaging examinations are hazardous to health because of the large amount of radiation, which is not necessary. At present, all tertiary hospitals and above have updated their examination equipment, which runs very fast and imaging speed, only for local scans, and the dose of X-rays used is small and has less impact on human health. Therefore, it is not a hindrance to have a checkup once a year.