There are many reasons for stomach pain, and it is also a frequent situation in life, the following is about the causes of stomach pain: 1, stomach pain caused by gastric acid stimulation, hydrogen ions in gastric juice can stimulate the gastric mucosa sensory nerves, and shoulder stimulation signals to the center, the person will feel pain. Stomach acid will also reflux into the esophagus, stimulating the esophageal mucosa, causing pain at the lower end of the sternum, which is not easily distinguishable from stomach pain. 2. Stomach pain is caused by overeating and drinking a lot of alcohol in life, especially for people with alcoholic habits. 3, stomach pain is caused by over-sensitive pain sensation of the stomach, if often sulking, mental stress, high sensitivity of visceral sensation, even if there is no obvious structural lesion, the pain will be felt. 4, stomach pain caused by inflammatory stimulation, especially acute inflammation caused by bacterial or viral infection, if the acute inflammation is not treated, it will be transformed into chronic gastritis. Chronic inflammation caused by Helicobacter pylori infection can also cause stomach pain hard 5, stomach pain caused by peptic ulcer, mostly after meals or fasting attacks, if not treated in time, does not exclude the possibility of causing ulcer perforation. 6, stomach pain caused by stomach tumor, if there is a tumor in the stomach, it will cause stuffiness, stomach distension, pain and other symptoms. The above are the causes of stomach pain. If you have symptoms of stomach pain, it is best to go to a regular hospital to have a gastroscopy to clarify the cause and then treat the symptoms.