High Blood Pressure Threatens One Third of World's Adults

The United Nations' World Health Day is April 7, and the World Health Organization this year is calling on the international medical community to step up efforts to prevent and control high blood pressure, a major cause of heart disease, stroke, and death. The UN health agency says one third of people over the age of 25 have high blood pressure. VOA's Carol Pearson reports that many of them don't even know they have it.