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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
Here are a few key takeaways from this article on drinking water and blood pressure: Dehydration is a key result when you fail to drink enough water, and this can lead to high blood pressure. Not drinking enough water also leads the blood to thicken. In turn, drinking more water can help thin thickened blood. Avoid drinking too much water. This can lead to overhydration and a condition known as hyponatremia.