Millions of people are at risk from the "silent killer" of high blood pressure, NHS chiefs have said, as they launched a new campaign urging people to get checked.If left untreated, high blood pressure can lead to heart attacks, strokes, kidney disease and vascular dementia.Up to 4.2 million people in England are thought to be living with high blood pressure without knowing it - around a third of all those with the condition.The new NHS Get Your Blood Pressure Checked campaign, which is backed b

Millions of people are at risk from the "silent killer" of high blood pressure, NHS chiefs have said, as they launched a new campaign urging people to get checked.If left untreated, high blood pressure can lead to heart attacks, strokes, kidney disease and vascular dementia.Up to 4.2 million people in England are thought to be living with high blood pressure without knowing it - around a third of all those with the condition.The new NHS Get Your Blood Pressure Checked campaign, which is backed by health charities, says people should find out their blood pressure numbers, as the condition can often have no symptoms.