Gastric cancer is the most common gastrointestinal tumor, and surgical resection is still the main treatment means. Research shows that the 5-year survival rate of early gastric cancer after surgery is over 95%, once lymph node metastasis occurs, the effect of surgery will be greatly reduced. Early detection and treatment are the keys to prolong life and improve prognosis. However, unfortunately, the early diagnosis rate of gastric cancer is extremely low, and even in the United States where healthcare is advanced, 80% of patients are already in the progressive stage of gastric cancer by the time they are diagnosed. Therefore, it is more important to correctly identify the early symptoms of gastric cancer to strive for the timing of surgery and improve the survival rate. 1. Abdominal pain: Most patients with gastric cancer have a long history of gastric ulcer, so they tend to take pain for granted and take it lightly. Unbeknownst to them, abdominal pain is one of the most common early symptoms of gastric cancer. On the contrary, the pain of gastric cancer often does not have obvious regularity, and the nature of pain has changed. Persistent abdominal pain indicates that the lesion has invaded the stomach wall, while the pain in the posterior sternum or anterior heart area indicates the possibility of cardia tumor. At this time, one should be alert to the precursor of cancer. 2.Weight loss: Due to tumor consumption, difficulty in eating and impaired nutrient absorption, 20%–60% of gastric cancer patients can show symptoms of significant weight loss in a short period of time and progressive wasting in the early stage. If the above situation occurs, the possibility of cancer is higher. 3.Supra-abdominal fullness, nausea and anorexia: Since gastric cancer tissue cannot secrete gastric acid normally, the stomach presents a low-acid environment; and since gastric cancer may invade the muscle layer, it affects the peristalsis of the stomach. Patients often have abdominal fullness and discomfort after eating, and have difficulty in emptying food. If the cancer is located near the pylorus, the symptoms are more obvious. Once it develops to pyloric obstruction, the phenomenon of vomiting overnight food may occur. Clinically, about 30% of the patients have nausea, anorexia and vomiting as the first symptoms. 4, conventional anti-ulcer treatment is ineffective: although gastric ulcer is stubborn, but in general the symptoms tend to be relieved or disappear after regular treatment in internal medicine. If 4-6 weeks of regular treatment is ineffective or recurrent after cure; if the ulcer is confirmed to be larger (diameter >2.5cm) or high ulcer by gastroscopy, especially for patients who are older than 45 years old and enter the age group with high incidence of gastric cancer, even if the biopsy is negative, they should be examined regularly to be alert to the possibility of cancer. 5. Chronic anemia or persistent positive occult blood in stool: Because of necrosis and ulceration on the surface of gastric cancer and persistent active small amount of bleeding, which leads to persistent positive occult blood in stool; coupled with impaired nutrient absorption and tumor consumption, patients mostly have chronic anemia, which is manifested in symptoms such as pale eyelids and lips, weakness and weakness. Therefore, for unexplained anemia and persistent positive occult blood in stool, one must be careful of the possibility of cancer. Nevertheless, the symptoms of early gastric cancer are still vague and non-specific, and sometimes it is difficult to distinguish from benign ulcers. Early gastric cancer mostly relies on gastroscopy and pathological biopsy to confirm the diagnosis. However, due to the painful nature of gastroscopy, it is difficult to be used as a routine examination, while barium meal of digestive tract is only suggestive of progressive gastric cancer. If patients have the above symptoms, they should go to hospital for examination as soon as possible to avoid delaying the disease. Therefore, raising health and hygiene awareness and paying attention to early symptoms of gastric cancer can truly lead to early diagnosis, early treatment and improved surgical results.