A physical examination with shadows in the lungs does not necessarily indicate a problem or the presence of a lesion. The concept of lung shadow is more general, is a medical imaging term, refers to the higher imaging area relative to the lung tissue, and can often be manifested clinically as: flaky shadow, patchy shadow, punctate shadow, mass shadow, nodular shadow, cords and stripes shadow, fibrous foci, calcified foci and so on. Lung shadows can be inflammation of the lungs, such as flaky or patchy shadows and punctate shadows; they can also be tumors of the lungs, such as huge mass shadows or nodular shadows; and they can also be old lesions, such as striated shadows, calcified foci, fibrous foci and so on. Therefore, if you find lung shadows on physical examination, you can’t simply think that there is something wrong.