Stomach pain from eating grapes is related to excessive intake, too cold temperature, gastritis and gastric ulcer disease. Grapes themselves have the function of quenching thirst and stomach, and are alkaline fruits, so eating grapes appropriately will not affect the stomach and intestines. However, when eating grapes, once the intake is too much, it will lead to excessive expansion of the stomach body, which will affect the digestive function, and some people will experience mild stomach pain as a result. When eating grapes, you should try to choose grapes at room temperature. Once you eat chilled grapes, the temperature of the grapes is too low, so it will cause stimulation to the gastric mucosa, which will lead to spasmodic contraction of the stomach wall and cause stomach pain. Some people who have stomach pain after eating grapes are suffering from gastritis and gastric ulcer diseases. These people eat grapes in large quantities, because the sugar content in grapes is too high, so it will stimulate excessive secretion of gastric acid, thus inducing the onset of the disease and causing stomach pain.