Younger patients without underlying gastric diseases can usually have a gastroscopy about once every two years. However, if they are older and have underlying gastric diseases, especially potentially cancer-prone diseases, family history of gastric cancer, etc., the frequency of review should be more frequent. Young patients without underlying stomach diseases and with normal gastroscopy, it is relatively safe to have gastroscopy within two years, but clinically there is no absolute saying that it is less likely to form gastric cancer within two years, and even if unfortunately they have gastric cancer, it should be early. However, there are some underlying diseases of the stomach, such as gastric ulcer, atrophic gastritis, reflux esophagitis, etc., which may cause potential cancer risk and need to be reviewed frequently according to the pathological biopsy of atypical hyperplasia, some of which may need to be reviewed at least once a year. For atrophic gastritis with severe intestinal epithelial hyperplasia, a review once every 3 months or 6 months is recommended. For normal healthy people and some people with high risk of gastric cancer, the frequency and time of clinical review are different, and patients need to review regularly according to their own situation.