In China, stomach cancer is a common tumor, and its mortality rate is second only to lung cancer, liver cancer and intestinal cancer. However, since 80% of gastric cancer has no specific symptoms in the early stage, which makes the diagnosis difficult, it is important not to let go of any traces, especially some of the following misconceptions may make people lose their alertness to gastric cancer. I. Stomach disease is a problem of middle-aged and elderly people. Although the incidence rate of gastric cancer is higher in middle-aged and elderly groups, many hospitals in China reported that the incidence rate of gastric cancer among young people under 35 years old has been as high as 6-11%, and the malignancy degree is higher. As young people nowadays are under great pressure of study and work, irregular rest and diet, the incidence of gastric diseases such as gastric ulcer is not low. Therefore, when unexplained upper abdominal discomfort, bloating, vague pain, feeling of fullness, loss of appetite, nausea, vomiting, poor appetite, sleepiness, easy fatigue, progressive wasting and anemia, tarry stools or even vomiting blood, it is necessary to go to hospital for examination in time. Second, stomach disease is my old problem for many years, so I can just take some medicine by myself. 80% of early gastric cancer patients have no symptoms, and the few who have symptoms are atypical symptoms, which are easily confused with some gastric diseases such as gastritis and gastric ulcer. Therefore, don’t judge your disease based on past experience and symptoms and buy your own medicine to solve the problem. Thirdly, I have already removed most of my stomach after suffering from gastric ulcer, so it is impossible to get gastric cancer again Wrong. After most of the stomach is removed, it is still possible to get stomach cancer, which is called residual stomach cancer in medical science. The incidence of stomach cancer in patients with residual stomach is 2-12 times higher than that in healthy people, and 2-4 times higher than that in people who take medication for gastric diseases. The reason for cancer in the residual stomach is the loss of the function of the pylorus (the pyloric sphincter has two functions, one is to prevent the undigested food in the stomach from entering the duodenum; the other is to prevent intestinal fluid and bile from flowing back into the stomach to protect the acidic environment in the stomach), bile and pancreatic enzymes in the duodenum can dissolve epithelial cells and accelerate cell division; bile and intestinal fluid are mainly alkaline, which can easily damage the barrier role of the gastric mucosa; the residual stomach The increase of nitrite-producing bacteria in the residual stomach makes the concentration of carcinogenic nitroso compounds increase; the stimulation and high tension ligation during gastrectomy anastomosis may also become carcinogenic factors. Gastric cancer should not be taken lightly because of gastrectomy. Patients with benign gastric disease should strive for annual gastroscopy within 5 years after surgery, and should not refuse biopsy pathology examination. Common examination methods for gastric cancer include: fiberoptic endoscopy (commonly known as gastroscopy); barium meal X-ray examination; B-ultrasound examination; immunological examination: such as CEA; CT examination. Early gastric cancer is difficult to be shown by conventional CT examination, so it mainly relies on double contrast contrast imaging and fiberoptic endoscopy. Wire barium meal examination is the main examination method for gastrointestinal tumors, especially gastric hypotension double contrast imaging can show small gastric cancer or micro gastric cancer as small as 0.5 cm or less. 1-2 days before the examination, stop taking drugs that are impervious to X-ray or affect gastrointestinal function, such as bismuth subcarbonate, calcium gluconate, etc.; eat less dregs and easily digestible food the day before the examination, and fast after dinner; gastric lavage the night before the examination for patients with gastric retention; take 100 grams of barium sulfate powder at 2:00 a.m. on the day of whole gastrointestinal barium meal examination, and mix it with 200-300 ml of warm boiled water; relax emotionally. 300 ml of warm water; relax emotionally because swallowing barium is not harmful to the body and will not be absorbed and will be excreted with the stool; white stool will be relieved 1-2 days after this examination, but the examination cannot be done within 3 months of pregnancy. Gastroscopy and pathological biopsy are the gold standard for gastric cancer diagnosis, and can be performed after the doctor determines that there are no contraindications. Gastric tissue biopsy patients should not eat hot drinks and rough food immediately after the procedure. Many patients think that gastroscopy is too painful and are reluctant to undergo it. In fact, under modern technology, an endoscopy can be completed in 10 minutes, and taking some sedatives during the examination can reduce the pain. Since the 5-year survival rate of early gastric cancer can reach 80% after surgery, it is important to pay attention to the follow-up of patients with pre-cancerous lesions. These lesions mainly include: 1. chronic atrophic gastritis: the cancer rate is 8.6%-13.8%; 2. gastric polyps, especially multiple adenomatous polyps, the cancer rate is as high as 14%-59%; 3. gastric ulcers: the cancer rate is 1%-15%; 4. residual stomach; 5. gastric mucosal heterotypes The moderate to severe heterogeneous hyperplasia is very close to early gastric cancer, and some people regard severe hyperplasia as very early gastric cancer. To prevent stomach cancer, it is important to pay attention to diet, eat more fresh vegetables and fruits, eat more food containing vitamin A, B and E, and increase the intake of protein, dairy and milk appropriately to protect the gastric mucosa. Eat less or no pickles and leftovers. Avoid eating smoked, fried and moldy foods, and avoid smoking and alcohol.