Flocculent shadows in the lungs, which are pathological manifestations of the lungs found through imaging, are most often the manifestation of acute attacks of chronic bronchitis, clinically mainly due to long-term smoking or atmospheric pollution, work and living environments with varying degrees of dust, oil smoke, sulfur dioxide, etc. In addition, it can also be seen due to radiation irradiation stimulation over time, and also clinically due to acute bronchitis did not improve, gradually delayed and developed into chronic, but also mainly common in pathogenic infections including viruses, bacteria, etc., clinical manifestations of cough, coughing sputum.