Lung cancer with nausea in late stage may be related to digestive tract metastasis, intracranial metastasis, adverse reaction during treatment and other reasons. 1. Digestive tract metastasis: if tumor cells metastasize to the stomach and other parts of digestive tract, affecting digestive function, nausea, vomiting and other symptoms may appear. 2. Intracranial metastasis: If the tumor cells metastasize to the skull, it can cause intracranial hypertension and symptoms such as headache, nausea and projectile vomiting. 3. Adverse reaction during treatment: such as using chemotherapeutic drugs, targeted drugs and other treatments, which can cause damage to gastrointestinal tract, nausea, vomiting and other phenomena. It is suggested that people with nausea in advanced stage of lung cancer should go to hospital in time, clarify the cause of the disease and carry out standardized treatment under the guidance of doctors to avoid delaying the condition.