Lung cancer may develop gastric metastasis, and when gastric metastasis occurs, patients will have a series of digestive system symptoms. Lung cancer is a highly malignant tumor disease, and when it is serious, it will have multi-organ metastasis, such as liver, brain, bone, adrenal gland, stomach and so on, so it is possible for lung cancer to have gastric metastasis. When stomach metastasis occurs in lung cancer, patients will have a series of digestive symptoms, such as stomach pain, stomach distension, vomiting blood, black stool, poor appetite, emaciation, etc. At this time, in addition to actively treating the primary lesion, patients need to actively treat the clinical symptoms caused by stomach metastasis, so as to prevent the disease from deteriorating rapidly in a short period of time. If lung cancer is not treated in time, the risk of distant metastasis is higher. Therefore, once lung cancer is diagnosed, it is recommended to carry out systematic examination of multiple organs in the whole body to exclude the possibility of metastasis in multiple organs.