Blurred eyes, headache, nausea are common clinical symptoms, caused by the following main causes: 1. Hypertensive encephalopathy is a complication of hypertension, hypertensive patients who usually take drugs irregularly can cause unstable blood pressure, high blood pressure, headache, nausea, blurred vision and other acute complications. Severe patients can develop brain herniation causing coma. If you have a fever, there are many diseases that can cause fever, such as pneumonia and encephalitis, which can lead to high fever, food confusion, poor mental health, headache, nausea, vomiting, etc. You can take the temperature first to see if there are symptoms of fever. 3. If necessary, go to the ophthalmology department for treatment. 4. 5.Some cranial diseases can cause headache and vomiting continuously.