With stage A2 gastric sinus ulcer, there is a possibility of cancer, but the chances are usually small. Stage A2 gastric sinus ulcer indicates that the ulcer occurring in the gastric sinus is active and accompanied by peripheral erosion and edema, but there is no active bleeding for the time being. Generally, gastric sinus ulcers have a certain chance of becoming cancerous, but the chance of becoming cancerous is not particularly high. The prognosis of gastric sinus ulcer is better through active treatment, and proton pump inhibitors such as omeprazole and lansoprazole, as well as drugs such as aluminum thiosulfate and bismuth potassium citrate can be used to inhibit gastric acid secretion and protect gastric mucosa. If combined with Helicobacter pylori infection, quadruple therapy (e.g., omeprazole, bismuth potassium citrate, clarithromycin, amoxicillin) is needed. A light diet and regular rechecks are required on a daily basis, and immediate medical attention is recommended in the event of more pronounced abdominal pain, vomiting, black stools, vomiting of blood, and other uncomfortable symptoms.