Gastric cancer in young people is defined as those who are younger than 30 years old and have developed gastric cancer. With the improvement of diet structure, the incidence of gastric cancer is decreasing, but the age of incidence tends to be younger. Few early cases, high malignancy, prominent vomiting symptoms, anemia and bleeding, high proportion of female patients, long time to diagnosis and high misdiagnosis rate, and poor prognosis are the main characteristics of gastric cancer in young people. In order to achieve early detection of the disease, young people should pay attention to symptoms such as unexplained weakness and anemia, epigastric distension and pain, nausea and vomiting, poor appetite and abdominal lumps. Overspending health is killing life, young people should avoid the internal and external factors that may cause cancer. Maintain a good dietary structure and have three regular meals, especially breakfast. Avoid eating fried, smoked and salted foods. Live a regular life, adhere to a certain time of exercise every day, and avoid staying up all night. Quit smoking and limit alcohol. In addition to the above preventive measures, problems should be seen promptly. According to some studies, there is no significant difference between young people and elderly people in the effect of surgical treatment for stage 1 and 11 gastric cancer, both of which are in the category of better efficacy, and the survival rate of 2 years after surgery can reach 90%. In contrast, the surgical treatment of advanced gastric cancer (stage 3 and 4) is poor, prone to metastasis and recurrence after surgery, and the 2-year survival rate is only 20%. Gastroscopy is the “magic weapon” to detect gastric cancer. In the past, people were afraid of gastroscopy because they thought it would be very uncomfortable and resisted it very much. Nowadays, with the development of painless endoscopy, people’s acceptance of gastroscopy has increased dramatically, especially among young people.