Blood test for stomach cancer can be normal, but most of them will be abnormal, because stomach cancer can be accompanied by anemia, and patients need to follow the doctor’s instruction to carry out other laboratory tests, gastroscopy, gastric histopathological biopsy and imaging tests for diagnosis. Usually, gastric cancer patients are mostly accompanied by anemia, so the results of routine blood test are usually abnormal. And patients also need to follow the doctor’s instructions to carry out early gastric cancer three items, serum tumor markers, stool routine and other laboratory tests, so as to diagnose the disease. Patients also need to undergo gastroscopy and gastric histopathology biopsy under the guidance of doctors. Early stage patients may show small polypoid bulges or depressions, or flat type. In case of progressive gastric cancer, it will show a huge mass with uneven presentation, which may be accompanied by erosion, and may also bleed during biopsy. If gastric cancer screening is performed for a group of people, it should be accompanied by imaging tests such as barium X-ray, ultrasound gastroscopy, CT examination and magnetic resonance imaging, which are simple, non-invasive and affordable. Patients with gastric discomfort and anemia as indicated by blood tests should be alerted and are advised to seek timely medical treatment.