Dizziness and nausea may be caused by the following conditions: first, because of elevated blood pressure, because when blood pressure is elevated, it can produce a certain dilating effect on cerebral blood vessels, elevated cerebral blood pressure will cause unstable blood flow in the blood vessels, causing the phenomenon of vasoconstriction and diastole, and in this process will produce a certain pulling effect on the nerves distributed in the blood vessels, and at the same time, the elevated Second, it may be due to cerebral hemorrhage or cerebral infarction, epilepsy and other common cerebrovascular lesions, because when there are these cerebrovascular diseases, it will cause the neurological dysfunction of the brain, and the nerves of the brain play an important role in governing the movement and sensation of the whole body, if the nerves of the brain function abnormally, it will also appear Dizziness, vertigo, and nausea.