In patients with stomach cancer, the stool may be partially different from normal stool. The stomach is the upper gastrointestinal tract, and with a small amount of bleeding, the patient will have yellow stools. Only with a relatively moderate amount of bleeding, black color will appear in the stool. A routine clinical test for stool occult blood will reveal 1 +, 2 + and 3 +, representing bleeding from a gastric lesion. There is also bleeding from the large part of the stomach, in which case the patient will experience acute nausea, vomiting and blood vomiting, in which case prompt medical attention should be sought. If it is found that the tumor lesion damages the blood vessels causing to come to a large amount of vomiting blood, these patients may have yellow stools but immediately indicated by vomiting blood. It is recommended that such patients should be seen promptly for vascular embolization in the interventional department. For patients with small and moderate amounts, the stool test may be yellow, but the occult blood is 1 + and 2 + to find the nature of the lesion whether it is celiac disease, ulcer or gastric cancer. For celiac disease and ulcer, treatment should be given according to celiac disease and ulcer, and hemostatic drugs should be added. For gastric cancer, the stage should be determined and appropriate anti-tumor therapy and symptomatic support therapy should be given according to the stage.