Stomach cancer patients usually have no characteristic signs on their tongues, and in the early stage, they only show heartburn, indigestion, epigastric discomfort, etc. In the middle and late stage, abdominal pain and weight loss are the main symptoms. Most of the stomach cancer patients have no early symptoms, some of them only show mild manifestations such as epigastric discomfort, indigestion, etc. The most common manifestation of the further development of the disease to the middle stage is pain in the left upper abdomen, which can be accompanied by poor appetite, anemia, abdominal masses, etc. In advanced stage, severe pain in upper abdomen is the main symptom, and there are vomiting blood, black stool and progressive emaciation. Gastric cancer cannot be diagnosed by tongue, but needs to be combined with other symptoms and signs and relevant clinical examination. If there is any discomfort, it is recommended to consult a doctor in time, and improve the examination under the guidance of a doctor to clarify the condition.