High blood pressure happens when the force on the walls of blood vessels (caused by the blood within them) is more than normal. This means the heart has to work harder and the blood vessels are under more strain, making it a major risk factor for stroke and heart attack.

The risk of high blood pressure rises with age. But it's also more common if you have diabetes or a family history of high blood pressure. Eating a lot of salt, not exercising regularly, being overweight, drinking a lot of alcohol and stress also increase your risk.

One of the problems with detecting high blood pressure is that it virtually never causes symptoms in the short term. That's why it's important to get your blood pressure checked regularly. Knowing you have high blood pressure can allow you to make lifestyle changes, and if necessary take medication, to reduce your risk. How much will it cost? This is a free NHS service for eligible people.