Gastric sinus congestion and edema suggest an inflammatory reaction of the gastric mucosa, including acute gastritis and chronic gastritis. It is usually believed that acute gastritis is not cancerous, while chronic gastritis has a tendency to become cancerous, especially chronic atrophic gastritis. Acute gastritis is usually caused by acute stimulation of gastric mucosa within a short period of time, for example, drinking a lot of alcohol, taking corrosive chemicals such as strong acid and alkali by mistake, using non-steroidal anti-inflammatory drugs for a long period of time, etc. After removing the causes of the disease and treating the symptomatic condition, it can be cured and basically will not become cancerous. Chronic gastritis, especially chronic atrophic gastritis, belongs to precancerous lesions. Long-term inflammatory reaction will stimulate the gastric mucosa cells to regenerate continuously, and abnormal cell proliferation may occur in the process of regeneration, forming intestinal epithelial hyperplasia or even heterogeneous hyperplasia, and these lesions have the tendency to become cancerous. It is recommended that patients with chronic gastritis should be actively treated, and regular gastroscopy should be done to observe the changes of the condition, and timely intervention should be made if cancerous changes are found to be possible to avoid the progression of the condition.