Lung flocculent hyperdense shadow is a shadow of increased density in the lungs during imaging, which is mostly considered to be caused by tuberculosis, lung abscess, bacterial pneumonia, and other diseases such as fibroma of the lungs. 1. Tuberculosis: Tuberculosis is caused by infection with Mycobacterium tuberculosis, and patients may experience symptoms such as coughing, coughing up sputum, hemoptysis, night sweats, and chest pain. In addition, when patients do CT examination of the lungs, there will be flocculent high-density shadows in the lungs. 2. Lung abscess: Lung abscess is caused by Staphylococcus aureus, Streptococcus pyogenes, Haemophilus influenzae type B and other factors. Patients will have symptoms such as coughing up sputum, cough, chest pain and fever. And when chest X-ray is done, there will be a large, dense, fuzzy, flocculent, high-density shadow in the lungs, and the border around it is not clear. 3. Bacterial pneumonia: Bacterial pneumonia is considered to be caused by Pseudomonas aeruginosa, Streptococcus pneumoniae, Staphylococcus aureus and other pathogens. Patients will not only have chills, high fever, cough, chest pain and other symptoms, but also have flaky, flocculent infiltrative high-density shadows on lung imaging. 4. Other: flocculent dense shadow in the lungs may also be caused by lung fibroma, lung cancer and other diseases. It is recommended that patients undergo routine blood tests, lung puncture, bronchoscopy and other tests to clarify the specific cause of the disease. It is recommended that patients undergo lung imaging such as flocculent dense shadow, and accompanied by coughing, chest tightness, wheezing and other manifestations, need to consult a doctor in a timely manner, the doctor will be for the cause of the cause of the selection of appropriate measures for treatment.