Whether a nodular shadow in the lung is important or not should be judged by the clinician according to the specific situation, such as the nature and size of the nodule, and cannot be simply defined as important or not important. Lung nodular shadows mostly appear during chest radiographs and chest CT examinations, and are mostly benign nodules, and some of them are early lung tumors. Benign nodular shadows in the lungs are mostly caused by bacterial infections in the lungs, benign tumors, etc. Some patients do not need special treatment and need to go to the hospital for review and monitoring, which is usually not particularly important. If it is a malignant nodule, it is more important and needs to be treated as soon as possible, usually thoracoscopic lung nodule resection. After pathological examination, according to the infiltration range of lung cancer, it will be decided whether chemotherapy or targeted therapy is needed, so as to avoid nodule enlargement, distant metastasis and various clinical symptoms caused by the tumor. If there is a shadow of lung nodule, consult a doctor as soon as possible and actively cooperate with the doctor for examination and treatment.