the theme of world health day 2013, marked on 7 april 2013, was the need to control raised blood pressure (hypertension) as a "silent killer, global public health crisis". the slogan for the campaign was "healthy heart beat, healthy blood pressure”. the who reports hypertension – which is both preventable and treatable – contributes to the burden of heart disease, stroke and kidney failure, and is an important cause of premature death and disability. the organization estimates one in 3 adults has raised blood pressure.