Lung cancer is a common malignant tumor of the respiratory system, and many patients with lung cancer are prone to clinical manifestations of breath-holding. Some patients suffocated their breath because the cancer tissue invaded the pleura and caused pleural effusion, and a large amount of pleural effusion compressed the lung tissue and thus suffocated their breath, which can be treated with local chest drainage and injection of drugs to reduce the formation of pleural fluid and thus improve the symptoms of suffocated breath. There are also patients with decreased lung function due to lesions, which cannot be compensated by healthy lung tissues yet. While controlling the tumor, antispasmodic and wheezing drugs can be given to improve the symptoms. Some patients have lung cancer complicated with obstructive pneumonia and other symptoms, so they can be given anti-inflammatory treatment on the basis of controlling the primary disease and antispasmodic and wheezing treatment to improve the symptoms of breathlessness, such as dihydroxypropyl theophylline, aminophylline and other antispasmodic and wheezing drugs.