Patient: What is the cause of asthma, cough and small amount of fluid in the chest after lung cancer surgery and four times of chemotherapy? Doctor: The information is incomplete. Please provide the patient’s surgery record and post-operative pathology report, and perform chest CT examination, blood routine and biochemical examination. It may be due to inflammatory exudation, tumor dissemination, or low protein level. If there is more fluid in the chest, it is recommended to extract chest fluid for laboratory test. The patient’s “cough and asthma” symptoms may be caused by local inflammation or pleural irritation, but we should also be alert to the enlarged mediastinal lymph node metastasis compressing the airway. CT chest examination is recommended.