China is second only to Japan as a region with high incidence of gastric cancer. Experts warn that high-risk people should not fear gastroscopy, and it is better to check gastroscopy no more than once every three years, so that many gastric cancer patients have already progressed to the middle stage once they are found. Generally speaking, if you have problems such as feeling stomach discomfort or pain, loss of appetite and weight loss, it is best to check gastroscopy, which is a necessary test to confirm the diagnosis of stomach cancer. Other diagnostic methods include imaging examinations (such as CT, MRI, barium meal, etc.), laboratory tests, etc. Imaging examination of gastric cancer X-ray – gas-barium double imaging is a traditional examination method, which clearly shows the fine structure of gastric mucosa through double contrast images, mucosal images, filling images and compression images. The sensitivity of this method is 60%-80% and the specificity is 80%-90%, and the mortality rate of gastric cancer is reduced by 40%-60% after it is used for general surveillance. In Japan, gas-barium imaging combined with gastroscopy is used to screen the population, and the detection rate of early gastric cancer can reach more than 80%. However, it has been gradually replaced by gastroscopy due to the low diagnosis rate of early gastric cancer, which is not paid much attention and is influenced by the operator’s experience. Barium X-ray examination After the patient drinks barium during the examination, by changing different positions and fluoroscopic angles, plus using the contrast of air, the outline of the digestive tract and mucosal changes can be presented, according to which the lesions in the stomach can be judged. General malignant lesions can be detected by upper gastrointestinal radiography, but early gastric cancer or smaller lesions can be easily missed by radiography, which requires a high level of skill and experience. Therefore, barium meal X-ray is difficult to diagnose early gastric cancer, and should be combined with gastroscopy and other comprehensive diagnosis. CT scan shows limited or diffuse gastric wall thickening, limited soft tissue mass in the gastric cavity, narrowing of the gastric cavity, some niches can be seen, and enhancement of the mass on enhanced scan. The fatty layer of gastric wall disappears, and the tumor is connected with the neighboring organs with unclear demarcation and uneven contact surface, which often indicates that the tumor invades the neighboring tissues and organs. Some of them can be seen in the small omental bursa on the side of gastric lesser curvature, para-aortic, peri-pancreatic lymph node enlargement, and in distant metastases, multiple low-density lesions in the liver can be seen. Early gastric cancer lesions are limited to the mucosa and submucosa layer and have not yet caused thickening of the gastric wall, so CT scan has little significance in the diagnosis of early gastric cancer, but CT scan can be used as a supplement to upper gastrointestinal imaging to determine the stage of gastric cancer and provide a basis for guiding clinical treatment plan. Experts remind that at present, the main treatments for gastric cancer are surgery, chemotherapy, radiotherapy and supportive therapy. Among them, surgery is the only means to cure gastric cancer, but 60% of patients may have recurrence and metastasis after surgery. In response to some patients’ fear of chemotherapy, Shen Lin pointed out that it is unnecessary and the current chemotherapy can be taken orally at home, which is relatively mild and safe.