Why is it said that lung CT scans should be avoided as much as possible during physical examinations

Routine lung CT scans are usually not recommended during physical examinations unless there are specific high-risk factors or suspected lung diseases. Pulmonary CT has radiation exposure risks and limited screening value for asymptomatic populations, which may lead to unnecessary follow-up examinations or psychological burdens. In routine physical examinations, chest X-rays or low-dose spiral CT are usually used as initial screening methods for lung diseases. If healthy individuals have no smoking history, family history of lung cancer, long-term occupational exposure, and other risk factors, undergoing lung CT may lead to overdiagnosis. The radiation dose of CT examination is significantly higher than that of X-ray, and multiple accumulations may increase the potential risk of cancer. For small nodules accidentally discovered in the lungs, most of them are benign lesions, but they may require long-term follow-up observation, leading to waste of medical resources and anxiety of the examinee. Some medical institutions have the phenomenon of over recommending high-end examinations, while international guidelines only recommend regular low-dose CT screening for specific high-risk populations. When there is a history of long-term smoking, asbestos exposure, or chronic cough, doctors may recommend targeted low-dose CT scans. The population over 50 years old and smoking for 30 packs of cigarettes per year is a key target for lung cancer screening. When occupational dust exposure occurs or there are multiple lung cancer patients in the family, an individualized examination plan needs to be evaluated. Patients with a history of lung disease or tumor may require CT monitoring of changes in their condition during follow-up examinations. When warning symptoms such as hemoptysis, persistent chest pain, and unexplained weight loss occur, imaging evaluation should be performed immediately regardless of whether a physical examination is conducted or not. The selection of physical examination items should be based on personal health status and doctor's evaluation, to avoid blindly accepting radiation tests. Maintaining a regular daily routine, staying away from tobacco pollution, and paying attention to respiratory protection are more practical than overly relying on imaging examinations for basic health management. When persistent respiratory symptoms occur, timely specialized medical treatment should be sought instead of waiting for the annual physical examination.