Lung cancer is a malignant tumor of the respiratory system, and there are no relatively specific tumor markers for lung cancer. However, some indicators are meaningful for diagnosis or postoperative follow-up of lung cancer, such as carcinoembryonic antigen CEA, which may be elevated during the treatment and follow-up of lung cancer patients, indicating possible disease progression. Some patients have enteritis and other conditions may also lead to an increase in this indicator. The SCC antigen has a certain reference value in patients with squamous lung cancer and will show elevation. In addition, there is another indicator called NSE, also called neuron-specific enolase, which is elevated in some patients with lung adenocarcinoma. The diagnosis of lung cancer can be confirmed only after CT examination to detect the occupying lung lesions and then further pathology.