Acute gastroenteritis is caused by acute gastroenteritis, intestinal obstruction and pancreatitis. Acute gastroenteritis can cause symptoms in the digestive system, mainly abdominal pain, bloating and diarrhea, and acute gastroenteritis can affect the stomach, causing nausea and vomiting. When the body has an intestinal obstruction, the contents of the intestine cannot be expelled, resulting in excessive dilatation of the intestinal cavity and a feeling of abdominal distension, as well as pain. The inability of the contents to be discharged normally will lead to an increase in intestinal pressure, which will affect the discharge of food from the stomach leading to nausea and vomiting, and in severe cases, the food in the intestines will be vomited out. During an attack of pancreatitis, the inflammation of the pancreatic organ causes involvement of the surrounding area, resulting in a feeling of difficulty in the abdomen. The lack of digestion of food by pancreatic fluid during an attack of pancreatitis can also cause indigestion, leading to nausea and vomiting.