Shadows on the lungs may be caused by lung infections, interstitial lung lesions, tumors, and so on. Whether the problem is big or not is related to the specific nature and severity of the shadows. For example, shadows caused by tumors are a big problem and need to be treated with surgery as early as possible. Serious lung infections that are not treated in time and the lesions continue to progress will also become a bigger problem. 1. Lung infection: lung tissue infection caused by various reasons can lead to exudative lesions in the lungs, with a small amount of tissue fluid in the alveoli, followed by the formation of shadows. Anti-infection treatment should be given promptly after a clear diagnosis is made. Inadequate treatment and lung infection can also lead to life-threatening respiratory failure. 2. Interstitial lesions: some patients suffer from interstitial pneumonia due to viral infection, which manifests itself as shadows in the lungs. As above, timely treatment can help improve the patient’s prognosis, while delayed treatment can aggravate the condition. 3. Tumors: lung tumors may also cause shadows in the lungs, which is a more serious condition, and patients are advised to confirm the diagnosis through puncture biopsy and bronchoscopy. After diagnosis, patients should choose comprehensive treatment such as surgery, chemotherapy, radiotherapy and target cell drug therapy according to their conditions. Please follow the doctor’s instructions for the specific treatment plan. When there are shadows on the lungs, there may be other causes, such as old lesions, pneumoconiosis, etc. It is recommended to complete the relevant examinations in time to clarify the cause of the disease and then timely treatment.