Flocculent dense shadows in the lungs can be caused by infections, inflammation, tuberculosis and tumors, which require sensitive antibiotics such as cephalosporin, surgery or radiotherapy to avoid life-threatening conditions. There are many reasons for flocculent hyperdense shadows in the lungs, and there are different treatments for the cause of the symptoms. If the flocculent hyperdense shadows are caused by non-specific bacterial infections such as Aureobasidium, sensitive antibiotics such as cephalosporins need to be taken orally or injected after drug sensitivity tests; specific tuberculosis infections need to be treated with corresponding bactericidal medications such as isoniazid, rifampicin and so on. When the flocculent high-density shadow in the lung is caused by bronchial lung cancer or other tumors, after perfecting chest CT and biopsy and other auxiliary examinations to confirm the diagnosis, according to the stage and other options such as surgical resection and lymph node dissection of the local or large scale, radiotherapy before and after surgery, radiotherapy and other palliative treatments only, if the diagnosis and treatment are not confirmed in time, it may lead to the spread of the tumor progression and even endanger the life. It is recommended to seek medical treatment in time to rule out tumor and other serious conditions when the above situations occur, to avoid cancer spreading or progressing to advanced stages and to choose corresponding treatments in time.