There is no causal relationship between stomach pain and stomach cancer, so there is no such thing as how long stomach pain will lead to stomach cancer. Stomach pain is a clinical symptom of gastric cancer, and it is a very common clinical symptom of gastric cancer, which is mainly seen in progressive gastric cancer, and there is almost no symptom of stomach pain in early gastric cancer. Gastric pain is not only found in gastric cancer, but also in other benign diseases of stomach, such as acute and chronic gastritis, gastric ulcer, duodenal ulcer, gastroesophageal reflux disease and functional dyspepsia. Patients with recurrent stomach pain symptoms, especially those with family history of stomach cancer, need to go to the hospital as soon as possible and cooperate with doctors to examine electronic gastroscopy to help clarify the diagnosis. The diagnosis of gastric cancer can only be confirmed by gastroscopy plus pathological biopsy, and clinical symptoms cannot be used to determine whether there is gastric cancer.