High blood pressure (hypertension) is the leading preventable cause of death, driving millions of heart attacks, strokes and cases of dementia and kidney disease every year. It occurs when the pressure in the blood vessel walls is consistently too high and may be driven by behaviours we can change (e.g. diet, alcohol intake and inactivity) and factors we cannot (e.g. family history, age and ethnicity). Certain medical conditions may also increase the chance of developing high blood pressure, such as obesity, diabetes and kidney disease. Despite the serious risks, high blood pressure is often overlooked. It’s called a ‘silent killer’ as there are usually no symptoms. Around 1.4 billion adults are living with high blood pressure globally - around three-quarters in low- and middle-income countries - yet an estimated 600 million people don’t even know they have it. Without action, fewer than a quarter of people with high blood pressure will ever have it under control. This crisis is