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Medicine

Renal Handling of Sodium and Water in Hypertension

Quick fact

A tiny increase in sodium reabsorption—just enough to raise blood sodium by a few milliequivalents—can hold excess water in the body and push blood pressure into the hypertensive range.

Why this is interesting

Your kidneys filter about 150 liters of fluid a day, yet you produce only about 1–2 liters of urine. So what happens to all that water, and why can that hidden process raise your blood pressure?