Lung cancer with dyspnea should be examined by CT first, and after the cause is clarified, treatments such as oxygen absorption, puncture and asthma calming should be carried out. Common causes of lung cancer with dyspnea are lesion compressing airway and pleural effusion, CT examination is needed to clarify the causes. If the lesion compresses the airway, it needs timely treatment such as asthma, oxygen absorption, implantation of stent, etc. to alleviate the clinical symptoms of the patient, and after stabilizing, according to the pathological category, chemotherapy, radiotherapy targeting and other treatments should be chosen to shrink the tumor and alleviate the symptoms. For patients with pleural effusion, thoracocentesis is performed to drain the effusion and relieve lung compression, which can significantly relieve symptoms. Therefore, for lung cancer with dyspnea, after clarifying the cause of the disease, active treatment is necessary to have better results.