Nausea and vomiting, caused by a variety of reasons: First, if a woman of childbearing age, the first rule out pregnancy reactions. Second, hypertension, nausea and vomiting are usually accompanied by dizziness. Third, various causes of gastric disease, resulting in pyloric edema, pyloric obstruction or gastric spasm, can cause nausea and vomiting. Fourth, acute pancreatitis, this kind of nausea and vomiting accompanied by epigastric pain, fever and other symptoms. Fifth, intestinal obstruction, this kind of nausea and vomiting accompanied by abdominal pain, stool obstruction or bowel obstruction and other symptoms. Sixth, renal vomiting, which can occur in patients with renal insufficiency. There are various causes of nausea and vomiting, here are only the common causes, further determine the cause in addition to the above symptoms, but also based on physical and chemical examination to further confirm the diagnosis.