Asymptomatic lung shadows found in physical examination need to be judged whether they are serious or not according to their causes, such as serious lung cancer, pneumonia, etc. and less serious benign lung nodules, etc. Lung shadows will appear. 1. Lung cancer: Early stage of lung cancer can be asymptomatic, only the tumor can be seen in imaging, fiberoptic bronchoscopy + biopsy can be done to make a clear diagnosis, and comprehensive treatment is adopted in treatment, i.e., the main surgical treatment + chemotherapy, radiotherapy, immunotherapy, and traditional Chinese medicine treatment. 2. Pneumonia: some people with pneumonia, especially the elderly, may not have any symptoms, and need to further improve the relevant examination to confirm the diagnosis, and the treatment is mainly aimed at anti-infection treatment. 3. Benign lung nodule: it may only have imaging manifestations, and can be clearly diagnosed by puncture biopsy of lung tumors. For treatment, regular examination can be carried out to observe the growth rate and size of the tumor, and once clinical symptoms or signs appear, those with malignant tendency will need to undergo surgical resection of the lungs. Physical examination found lung shadow, it is recommended to go to the hospital in time, and actively cooperate with doctors for treatment.