Patchy and cord shadows in both upper lungs may be due to the fact that the examiner has suffered from respiratory diseases, such as pneumonia, bronchitis, tuberculosis, etc., or long-term smoking. 1. Respiratory diseases: the examiner suffered from respiratory diseases before the examination, such as pneumonia, bronchitis, tuberculosis, chronic obstructive pulmonary disease, etc. The stimulation of inflammatory substances and the change of respiratory function lead to abnormalities in the lung tissues, and patchy and corded shadows will appear in the chest X-ray. 2. Smoking, irritating gas inhalation: if the examinee smokes for a long time, or engages in coal mine or chemical industry, inhaling dust or irritating gas for a long time, the harmful substances contained therein will stimulate the mucous membrane of the respiratory tract, causing inflammation of the lungs and destroying the normal tissues, and the inflammation area will appear patchy and streaky shadows in the course of time. 3. Tumor: Cancer cells will erode normal lung tissues and continue to proliferate and mechanize, forming abnormal tissues, which can also show patchy and streaky shadows in chest radiographs and other examinations. If you find patchy and streaky shadows on chest X-ray, there may be other reasons, so it is better to complete the examination and carry out cytology and histology pathology to clarify the cause of the disease and then cooperate with the treatment.