Solid shadows in the lungs are imaging findings that are the result of lung atelectasis, alveolar effusion causing loss of gas in the lungs, and substantial changes in the lung tissue, mostly due to diseases such as pneumonia and emphysema. Solid change shadow in the lung is mainly a high-density shadow in the lung segments of the lung, which is a pathological phenomenon. When the lung tissue shows substantial changes, a large amount of exudate can fill in the alveolar cavity, resulting in the reduction or disappearance of air in the alveolar cavity, and the condition of solid shadows in the lungs can occur. When pathogens invade the lungs beyond the host’s voluntary immune capacity, resulting in exudates in the alveolar cavities and triggering pneumonia, imaging shows solid shadows in the lungs. Patients with emphysema may also exhibit solid shadows in the lungs due to decreased airway elasticity of the respiratory bronchioles, which are persistently abnormally overloaded and overinflated, and may show increased leakage from the surrounding capillaries. There are many other causes of solid shadows in the lungs, such as pulmonary infarction, hypersensitivity pneumonitis, tuberculosis, etc. It is recommended that the patient undergoes further examination to clarify the cause of the disease, and then actively cooperates with the doctor to take the relevant therapeutic measures.