In this case, the discomfort is partly due to psychogenic factors and is also called a functional intestinal disorder. In this case, most of the tests such as gastroscopy will not show any abnormalities. There are three main types of regulation in the normal body, including neuromodulation, humoral regulation, self-regulation, and mixed neurohumoral regulation. Most of the regulation in the intestinal tract is a mixture of neurohumoral regulation, so when the mental condition changes, it will affect the secretion of digestive juices in the intestinal tract to a certain extent, resulting in the above discomfort. However, since there are no local intestinal lesions, most of the examinations are not abnormal. In this case, temporary observation and appropriate mood regulation are sufficient and will recover on their own. There are also some causes of cold in the gastrointestinal tract or chronic diseases, but the symptoms are not typical, so the diagnosis can be confirmed after completing the relevant tests.