Bloating, nausea and vomiting are caused by indigestion, food poisoning, pyloric obstruction, intestinal obstruction, etc. 1, indigestion: Because food stagnates in the stomach, it cannot be emptied in time and produces a lot of gas after neutralizing with digestive juices, thus leading to stomach distention. When the pressure in the stomach increases food will be squeezed, so there will be nausea, vomiting performance. 2, food poisoning: eating a diet of compatible food, or food and a certain amount of toxins, will cause stimulation of the digestive system, so there is abdominal discomfort, nausea and vomiting performance. 3, pyloric obstruction: food in digestion, need to be discharged into the duodenum through the pylorus. Once the pyloric obstruction occurs, the food cannot be discharged, so it will be retained in the stomach, and the performance of bloating, nausea and vomiting will also occur. 4.Intestinal obstruction: The contents cannot be emptied because of the blockage of the intestine during the attack. The persistence of intestinal obstruction will lead to an increase in intestinal pressure and excessive expansion of the intestinal cavity, which will result in a feeling of distension. When the internal pressure in the intestine increases it also causes the food in the intestine to return to the stomach and vomit out the food in the intestine under the intestinal pressure.