Lung nodules with a diameter of <5mm are called micro nodules, 5-10mm are called small lung nodules, and 11-30mm are called lung nodules. For micro nodules <5mm, it is necessary to combine whether the patient has high risk factors for lung cancer (such as elderly male, smoking, family history of tumor, etc.), if there are no high risk factors, no follow-up, if there are the above high risk factors, annual review is recommended. For small nodules of 5-10mm, the doctor will make a comprehensive assessment based on the location, size, shape and density of the nodule to clarify the risk level of the nodule and formulate different follow-up plans according to different situations. Nodules larger than 10 mm require early diagnosis and treatment. However, more than 95% of the nodules detected by low-dose lung CT are benign nodules, just like the traces left by age on your lungs, so there is no need to panic too much, just follow the doctor's instructions for regular follow-up.