An upset stomach can have symptoms such as bloating, stomach pain, acid reflux, nausea and vomiting, and belching. Stomach discomfort may have many kinds of symptoms, clinically more common are stomach bloating, stomach pain, acid reflux, nausea and vomiting, belching and other symptoms, and stomach discomfort, also accompanied by eating and drinking difficult to digest, no appetite, diarrhea or constipation and so on. There are many causes of stomach discomfort, such as gastritis, gastric ulcer, gastric polyps and other diseases, and it is necessary to go to the hospital to do the relevant examination to determine the cause. Patients with stomach discomfort should go to the hospital in time to identify the cause and undergo diagnosis and treatment to avoid delaying the condition and causing more serious consequences.