Drinking an excessive amount of water in a very short timeframe primarily affects the brain and kidneys, a dangerous condition known medically as water intoxication or hyponatremia. When you consume too much water faster than your kidneys can excrete it through urine, the excess fluid dilutes the sodium concentration in your blood stream. This causes water to rush into body cells via osmosis, leading to dangerous cellular swelling. In severe cases, the resulting swelling inside the skull increases intracranial pressure, threatening brain function. Verification: Maintain balanced hydration and avoid consuming extreme quantities of water rapidly.
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