Blackening of the lungs actually refers to the finding of black shadows with increased density in the lungs when x-rays or CTs of both lungs are taken, which is clinically seen to be caused by many reasons. It is mainly seen in some diseases of the lungs, including chronic obstructive pulmonary emphysema, bronchiectasis combined with severe infection, tuberculosis caused by Mycobacterium tuberculosis infection, and malignant tumors, including bronchopulmonary carcinoma, alveolar cell carcinoma, and pulmonary metastases from some malignant tumors outside the lungs. Patients will present with significant cough, sputum and hemoptysis, accompanied by wheezing, shortness of breath, chest tightness and other symptoms of dyspnea. Enhanced CT scan or MRI can be done, and if necessary, bronchial fiber endoscopy can be taken to make a clear diagnosis.