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If someone has uncontrolled high blood pressure with very low blood volume, it can be a sign of the early stages of acute renal failure caused by the hypovolemia. It also can mean the body is reacting to the low blood volume and hypotension by constricting blood vessels to raise the low blood pressure as the heart beats faster to try to increase the low circulation and oxygen content of the blood and then the blood pressure can become unstable and be raised.

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Q: What causes high blood pressure without even having enough blood?
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