Whether lung cancer is accompanied by brain metastasis or not, brain metastasis is prone to intracranial hypertension, resulting in nausea, vomiting and other symptoms, which can significantly aggravate the gastrointestinal response and make the stomach uncomfortable. 2. 3. Lung cancer patients with gastric discomfort should also pay attention to whether they have been given chemotherapy and other programs, as chemotherapy drugs generally have serious side effects on the gastrointestinal tract. After chemotherapy, nausea and vomiting, even accompanied by liver and kidney function damage and elevated transaminases, can also cause stomach discomfort, even accompanied by chronic diarrhea caused by secondary infection. Therefore, stomach discomfort in advanced stage of lung cancer needs to be further treated according to the above conditions.