Coughing for two months does not necessarily mean lung cancer. Tuberculosis, pneumonia, chronic bronchitis, allergic pneumonia, allergic rhinitis and other diseases can all cause long-term chronic cough. Cough is only one of the clinical manifestations of lung cancer. Besides clinical symptoms, the diagnosis of lung cancer is mainly confirmed by imaging examinations and pathological examinations. If a lung mass is detected by imaging examinations, such as chest X-ray or chest CT, the preliminary diagnosis of lung cancer can be made by the location, size and shape of the mass, combined with the patient’s medical history, age, clinical symptoms and whether there are enlarged lymph nodes in the vicinity. A definite diagnosis of lung cancer can be made only if cancer cells are found in bronchoscopy or lung puncture biopsy and pathological examination results of nearby enlarged lymph nodes, or in sputum or pleural effusion. Therefore, if a patient has cough symptoms lasting for two months, it is recommended that the patient should go to the respiratory department of the hospital for systematic examination to rule out the possibility of lung cancer. If the diagnosis of lung cancer is confirmed, surgery should be performed as soon as possible.