Most of the early stages of stomach cancer have no abnormal sensation. Some of them may show discomfort or vague pain in upper abdomen, acid reflux, belching, etc., or they may show vomiting, loss of appetite, black stool, etc. Progressive gastric cancer may also show corresponding symptoms such as digestive tract obstruction and bleeding. 1.Age over 40 years old, healthy, no previous history of gastric disease, unexplained lack of appetite, feeling of fullness in the upper abdomen, dullness and heaviness in the heart, elusive vague pain in the upper abdomen, etc. 2.Weakness and fatigue. 3.After years of suffering from gastric ulcer, gastritis and other stomach diseases, the symptoms have recently increased and the regularity of pain has changed. 4.People who have had a major gastrectomy many years ago and have recently developed digestive system symptoms. 5, Occasional nausea, vomiting, bad breath, exhaling foul-smelling gas, vomit is rotten and sour food. 6.Progressive dysphagia with food reflux. 7.Vomiting blood, black stool, any elderly people without a history of gastric disease, once vomiting blood, black stool, must immediately go to the hospital for examination. Male patients or relatives with history of gastric cancer should pay particular attention to them. Prevention of gastric cancer 1. Primary prevention, correction of bad dietary habits, regular general survey and treatment of precancerous lesions. (1) Pay attention to changing the traditional methods of preserving food such as salting or smoking, and widely carry out the method of freezing and preserving storage. Raise the awareness of universal participation, and do not develop or limit the development of such food processing and preservation. (2) Change poor eating patterns. The incidence of this disease has been significantly reduced in Japan, a global area with a high incidence of gastric cancer, due to the change of lifestyle. Therefore, to prevent gastric cancer, we should first change the poor lifestyle, avoid long-term hot drinks, hot food and fast food, moderate exercise after eating, and do not sit down immediately to study or rest in bed. (3) Change bad eating habits, eat less or no smoked, pickled, barbecued and fried food, no leftover food, leftover vegetables, moldy and spoiled food. (4) Reduce the occurrence of gastritis and gastric ulcer, avoid momentary pain, overeating, pay attention to dietary hygiene, eat less raw, cold, hard and irritating food. (5) Cultivate good eating habits, eat regularly and moderately, eat regularly and quantitatively, quit smoking and limit alcohol, change the diet structure, limit salt intake, eat raw onion and garlic in moderation, eat more fresh vegetables, fruits, soy milk and milk, fresh milk is rich in vitamin A and protein, colloid, etc. can protect the gastric mucosa from carcinogens. Some studies have proved that the relative risk of stomach cancer is reduced by 30% to 70% for people who regularly consume fresh vegetables and fruits. (6) Drink more tea: green tea is the best and black tea is the second best to prevent and treat stomach cancer. (7) Keep a happy spirit, avoid mental stimulation, adhere to physical exercise, maintain the balance of the internal environment of the body and improve the ability to fight cancer. 2.Secondary prevention early detection, early diagnosis and early treatment (1) Raise the awareness and alertness of cancer development, actively participate in the screening, all people over 35 years old with a history of long-term gastric disease and residents in areas with high incidence of gastric cancer should participate in the screening (2) Actively treat precancerous diseases and precancerous lesions of gastric cancer, such as gastritis, gastric ulcer, gastric polyps, etc., and pay attention to regular follow-up observation. (3) Those who have family history of gastric cancer should pay attention to regular checkups and promptly seek medical consultation when signals of gastric cancer appear. 3.Tertiary prevention for advanced patients to reduce complications and improve the quality of life. Rehabilitation of gastric cancer 1. Patients with gastric cancer should pay attention to face the side effects, complications and sequelae of treatment and strengthen exercise to promote recovery. 2.For one year after major gastric resection, the stomach volume is limited, so it is appropriate to eat less and more meals and enter high nutrition diet, and gradually transition to normal diet. 3.Regular review: review every 3 months within 1 year after gastric cancer surgery, generally every 6 months in the second year, and annually thereafter. The examination items generally include chest X-ray, B-ultrasound, CT, blood sampling for related tests, gastroscopy and MRI if necessary. Please pay attention to fasting in the morning of the review. 1.Prohibit eating moldy or rotten food. 2. High-salt diet is forbidden. 3. Prohibit excessive stimulating food, such as chili pepper, pepper, etc. 4.Prohibit smoking and alcohol. 5.After surgery, patients should eat milk, sugar and high-carbohydrate diet carefully to prevent dumping syndrome. 6, eat less or no smoked food and excessive pickled vegetarian dishes. 7.Prohibit high-fat diet. IV. Screening of gastric cancer Upper gastrointestinal tract imaging is performed every 2 years. For high-risk group, it is recommended to have gastroscopy once a year.