There are many reasons for the presence of patchy shadows in the lungs, and depending on the case, the severity varies, and it is not to be assumed that the presence of patchy shadows in the lungs is very serious. However, it should be taken seriously. The most common cause may be pneumonia, which is a common and frequent disease that can affect both the younger and older population. The mortality rate varies among different groups of people, and is relatively high in the elderly. If the patient is young, it may be cured with timely treatment, while untimely treatment in elderly patients may cause death. Patchy lungs are not only for pneumonia, but may also be suggestive of patchiness. If, after anti-pneumonia treatment, the patchiness is not absorbed, or even increases in size, it may be necessary to consider other problems. The most important thing to pay attention to is lung cancer, which is now a highly prevalent disease with a relatively high mortality rate. If the lung cancer has not metastasized, there may still be a chance for surgery. If metastasis has occurred, other treatments, such as targeted therapy, radiotherapy, chemotherapy, or immunotherapy, may be needed. Patchy shadow may also be the manifestation of tuberculosis, or other diseases in the lungs, so the patchy shadow in the lungs is a non-specific manifestation, and different treatments according to different etiologies will cause different harms.