Gastric cancer is one of the most common cancers, and according to statistics, it is the first among the malignant tumors of digestive tract and the third among the cancers of the whole body in China. The age of onset is 40-60 years old, but it still accounts for 15%-20% under 40 years old, and there are more men than women, about 3:1. The etiology is not yet clear, but it is related to many factors, such as life, dietary habits and genetic quality. It is especially worth mentioning that certain diseases are precancerous state of gastric cancer, such as gastric polyp (mostly seen in those with diameter over 2 cm), gastric ulcer, chronic gastritis (especially chronic atrophic gastritis), etc. Clinical manifestations Early clinical symptoms of gastric cancer are not obvious or typical, such as vague pain in upper abdomen, belching, acid reflux, loss of appetite, mild anemia, etc.; with the development of the disease, symptoms are obvious, such as pain in upper abdomen, wasting and weight loss, etc., such as cancer of gastric sinus grows to a certain extent, obstruction may occur and vomiting may occur; cancer of cardia may have the feeling of obstruction in eating; vomiting blood may occur when gastric tumor breaks down or invades blood vessels. Patients with advanced gastric cancer may develop upper abdominal mass or other symptoms caused by metastasis, such as ascites and liver enlargement. Diagnosis Early detection and early diagnosis are the keys to improve the cure rate of gastric cancer in the end. Firstly, for those who are over 40 years old and have early gastrointestinal symptoms mentioned above without any cause or have a long history of ulcer and have obvious symptoms or pain pattern change recently, and secondly, those who have gastric polyps and other pre-cancerous lesions of stomach should have regular and systematic X-ray barium meal fluoroscopy, fiberoptic gastroscopy, pathology and cytology examination. Treatment 1.Surgical treatment. So far, surgery is the most effective treatment method for gastric cancer, especially for early gastric cancer; postoperative adjuvant continuous intraperitoneal thermal perfusion chemotherapy (which is a treatment method combining local chemotherapy and thermal therapy that has been recognized by the medical profession and carried out in the Department of Abdominal Surgery of our cancer hospital in recent years). 2. Systemic chemotherapy. Apply fluorouracil, cisplatin, mitomycin C, etc.