There are many causes of gastric distension, stomach pain and nausea: first of all, chronic gastritis is a common cause, after suffering from chronic gastritis will lead to irritation of the gastric mucosa, also accompanied by significant pain, and the pain is not regular. After the speed of food emptying is affected, there will also be obvious symptoms such as gastric distension and acid reflux, and some patients will also vomit, etc. At this time, it is recommended to do gastroscopy or H. pylori examination. Secondly, it may be caused by stomach tumor, which will gradually increase in size and cause painful symptoms, and also affect the digestive function of the stomach, resulting in bloating and nausea. Finally, it may be caused by cholecystitis. After entering the intestine, food needs to be mixed with bile to facilitate digestion, and bile secretion is reduced after suffering from cholecystitis, thus leading to symptoms of stomach bloating and nausea.