Why Dehydration Cause Orthostatic Hypotension?

Dehydration due to exercising or illness causes lower blood volume in the body, therefore less blood goes back to the heart when standing up, causing lower blood pressure. For the same reason, people taking high doses of diuretics (“water pills”) are more at risk for this condition.

On the contrary, people with OH symptoms should take liquids frequently and maintain hydrated. This will raise the blood volume in the body, and lower the risks of lower blood pressure.

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