High blood pressure
Easy read: Blood pressure (NHS Direct Wales)
High blood pressure is sometimes called the silent killer, as it often has no symptoms but can significantly increase your risk of heart disease, stroke and dementia.
Take the Blood Pressure quiz (NHS Choices).
For information how to reduce your blood pressure, visit How to reduce blood pressure - 6 top tips (British Heart Foundation).
For information why too much salt is bad for you, visit Watch: Why is too much salt bad for you? (British Heart Foundation)