Can dehydration cause high blood pressure? Absolutely! As you dehydrate, your body retains sodium and some of your ultra-small blood vessels (capillaries) can even close down somewhat and may increase blood pressure. High blood pressure is also your body’s early compensation for your blood being thicker and more sludge-like. But the second act is even worse… hypovolemic shock (not enough blood volume). It even sounds shocking. It can threaten your life. Don’t go there!
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