The discovery of particles in the lungs is a description of space-occupying lesions found in the lungs through imaging tests. In fact, it can be caused by a number of reasons, the most common one being the infection of the lungs. After the inflammation is completely subsided and cured, the lungs will be left with scars after the infection is healed, which will be manifested as particles, and there will be fibrotic and calcified lesions in them, for example, bacterial and tuberculous mycobacteria, etc. Clinically, it is also seen in idiopathic diffuse interstitial fibrosis of unknown cause, which is also caused by fibrotic lesions. Clinically, it is also seen in unexplained idiopathic diffuse interstitial fibrosis of the lungs, and similar granules are also caused by fibrotic lesions, which usually do not require special treatment.