Lung puncture is not necessarily lung cancer. Lung puncture is an examination method to determine the benign or malignant nature of the disease by puncturing the diseased tissues of the lungs under the guidance of CT or ultrasound via skin puncture or bronchoscopy, and sending the puncture specimen to pathology for examination. The diagnosis of lung cancer is based on clinical manifestations, imaging examinations and pathological findings. Clinical manifestations usually include cough, sputum, shortness of breath and dyspnea. Occupying lesions can be seen in imaging examination, and the key to diagnosis still depends on pathological examination. The primary means of pathologic examination is lung puncture. Lung puncture removes lung tissue for pathological testing to determine the presence of cancer cells, which helps to diagnose and confirm the type of lung cancer. However, if no cancer cells are found, a diagnosis of lung cancer is not always made. Lung puncture biopsy has an important clinical role, and patients with test results of malignant disease should undergo treatment such as surgery, radiotherapy or chemotherapy.