Lung cancer is a very common type of malignancy of the respiratory system. The direct cause of death from lung cancer at the end stage may be respiratory failure, which is relatively common. For example, liver metastasis may lead to ascites, jaundice, and liver failure, which may also lead to death. For example, liver metastasis may lead to ascites, jaundice and liver failure, which may also lead to death. In addition, brain metastases may also show increased intracranial pressure, which may lead to inability to eat, dizziness, headache, electrolyte disturbance, etc. This may also lead to direct death of the patient. Therefore, the cause of death may be different for different patients, but death is still mainly caused by respiratory failure.