How many Americans have high blood pressure but don't know it? Not that many, according to the National Health and Nutrition Examination Survey. By actually measuring the blood pressure of a representative sample of Americans and asking them whether they have high blood pressure, the CDC was able to determine not only the prevalence of hypertension but also awareness of the problem among those with the condition.
The 2011-12 survey results show that 29 percent of Americans aged 18 or older have high blood pressure. Among those with high blood pressure, 83 percent are aware of it, 76 percent take medication to lower it, and 52 percent have it under control.
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