A shadow on the right lung means that an opaque area can be seen in the right lung on chest X-ray. Lung shadow may be artifacts, that is, clothing buttons, wearing decorations and other artifacts caused by this need to check their own dress to rule out artifacts, can cause lung shadow of diseases such as lung infections, tuberculosis, tuberculosis, lung tumors and so on. If the general examination can not be clear, further intensive CT examination is needed, and pathology is taken and sent for examination. If you do not want to do the appropriate examination, you can diagnostic anti-inflammatory, anti-infection treatment for about two weeks, and then review the chest CT and compare the density and area of the shadow. If the shadow becomes smaller than before, it is considered to be caused by lung infection. If there is no obvious change or the shadow area increases after anti-infection treatment, it is not considered to be caused by lung infection, and further examination is needed to exclude tuberculosis, tumor and other diseases.