There are several reasons for sudden dizziness and blurred vision: First, hypertension, if blood pressure suddenly rises, people will experience dizziness and blurred vision, blood pressure should be measured immediately, and at the same time should lie still and use blood pressure medication, vision will be restored after blood pressure is lowered. Second, low blood pressure, especially people with cervical spondylosis are more likely to have this symptom and need symptomatic treatment. Third, low blood sugar, can be dizzy, blurred vision, then should immediately determine blood sugar, if blood sugar is too low should immediately oral sugar water, candy or food, blood sugar will rise after the vision will gradually recover, the symptoms can be relieved.