Many conditions can cause nausea, and the more common causes are as follows:1. If you are a woman of childbearing age, first rule out a pregnancy reaction.2. Hypertension, nausea caused by high blood pressure is often accompanied by dizziness and headache symptoms.3. Various gastric disorders can cause nausea, such as ulcers, erosions, and pyloric stenosis, which are often accompanied by gastric distention and pain.4. There are also some illnesses that can cause nausea, such as intestinal obstructions, which are accompanied by Abdominal distension, abdominal pain, difficulty in bowel movement, inability to pass stool. 5, in addition, kidney disease can also cause nausea, often accompanied by renal insufficiency. 6, cerebrovascular disease with elevated intracranial pressure can also cause nausea. The above is to judge from the symptoms, want to confirm the diagnosis also need further clinical examination.