The presence of nodules in the lungs about 3 mm indicates that lesions less than or equal to this value are visible in the lungs, which may be round or irregularly shaped lesions, and nodules of this value are also relatively small, either solid nodules or partially solid nodules. The benign and malignant nodules need to be further examined. In the case of benign nodules that are not serious, surgery can be performed to remove the nodules, but malignant nodules are more troublesome and patients are advised to cooperate with the doctor to take appropriate treatment. Generally, in the early stage of the disease, benign nodules are more common, so don’t be overly alarmed when small diameter nodules appear on physical examination, and actively go for relevant examinations, which are still better treated in the early stage.