Early gastric cancer screening includes screening by imaging and serological tests such as gastrin, pepsinogen and tumor markers for gastric cancer. 1. Screening by imaging includes general gastroscopy, capsule gastroscopy and upper gastrointestinal imaging. If lumps or ulcers are seen under gastroscopy or if niches or masses are seen under upper gastrointestinal imaging, further consultation in hospital is required. 2. Serologic screening mainly includes gastrin 17, pepsinogen and C13 or 14 breath test to detect Helicobacter pumilus. The main purpose is to determine whether H. pylori is infected and whether the gastric digestive function is abnormal through whether the test indicators are abnormal. Gastric cancer markers such as glycan antigen 72-4 can also be checked, which is often abnormally elevated in the early stage of gastric cancer. It is recommended that people who are over 45 years old and have daily digestive symptoms such as indigestion, belching, acid reflux, etc. should undergo early gastric cancer screening in a timely manner, and according to the results of the screening, consult a doctor in time for further checkups and treatments under the advice of the doctor.