Elevated blood glucose can cause dizziness in the following cases: In the first case, a significant increase in blood glucose can cause a significant increase in blood pressure, which can also lead to dizziness. In the second case, a significant increase in blood glucose will increase the viscosity of the blood and slow down the blood flow, which may cause transient ischemic attacks in some patients, also manifested as paroxysmal dizziness, but will be relieved in a short time. In the third case, the more serious case is that when the blood sugar rises to a certain level, it will cause the occlusion of cerebral blood vessels and lead to acute cerebral infarction, and the patient will also show continuous dizziness, accompanied by slurred speech or limb movement. If this situation occurs, you should go to the hospital as soon as possible, on the one hand, to control blood sugar, and on the other hand, to conduct detailed examination and treatment for cerebral vessels.