Generally there is no one-minute self-testing method for stomach cancer, because the symptoms of stomach cancer itself are not specific, and many patients are already in the middle and late stages after detection. Therefore, when some uncomfortable symptoms appear, it is necessary to seek timely medical consultation to identify the cause of the disease, so as not to delay the best treatment time of the disease. The clinical symptoms of gastric cancer are not specific, and most patients are asymptomatic in the early stage, and some patients may show symptoms of indigestion. As the cancer progresses, some gastric cancer patients may show symptoms such as emaciation, epigastric pain, nausea and vomiting, loss of appetite, unpleasant feeling of eating and food reflux, some patients may also experience constipation, lower abdominal discomfort and diarrhea, etc. At the end stage of cancer, symptoms such as cachexia, bleeding, gastric perforation, bloody stool, black stool and tarry stool will appear, and patients will become weaker and poor in spirit. As other diseases of stomach, such as gastritis, gastric ulcer, or other organ diseases, such as hepatitis, liver cancer, pancreatitis, etc., may also show symptoms similar to those of gastric cancer, therefore, the diagnosis of gastric cancer cannot be accurately judged only by symptoms, and it is necessary to go to hospital for anal examination and biochemical immunoassay for the presence of carcinoembryonic antigen, and then combine with barium X-ray, gastroscopy and gastric mucosal biopsy to confirm the diagnosis of gastric cancer.