Upset stomach, hiccups and diarrhea are caused by diseases such as acute gastroenteritis, irritable bowel syndrome and stomach cancer. During an attack of acute gastroenteritis, the stomach mucosa is spasmodically contracted due to the presence of inflammation, which not only causes a painful sensation in the stomach, but also causes hiccups due to the involvement of the diaphragm. The patient’s intestinal system is stimulated by the inflammation, and a stress response occurs, which is accompanied by diarrhea. Some people experience stomach discomfort and diarrhea when they are in a state of excessive emotional stress and excitement, which should be alerted to irritable bowel syndrome. The human digestive system is controlled by the plant nerves, and when there are bad emotions, it will lead to plant nerve dysfunction and induce the onset of irritable bowel syndrome, which will lead to hyperactive gastrointestinal function, thus causing stomach discomfort, burping and diarrhea. Stomach cancer is a malignant tumor disease, which will seriously affect the digestion of food in the stomach and most patients will suffer from stomach discomfort. As cancer cells will invade the surrounding organs, once it invades the diaphragm, patients will often have hiccups. Since stomach cancer will affect the digestion of food, most patients will have a change in bowel habits, and some of them will have diarrhea.