World Hypertension Day is observed on May 17 every year to spread awareness about the disease that the World Health Organisation (WHO) calls a “silent killer” and “global public health issue.” The theme of this year’s World Hypertension Day is Know Your Numbers. It aims to increase high blood pressure (BP) awareness in all populations around the world, according to the World Hypertension League. According to the WHO, hypertension is the “most important preventable cause of heart disease and stroke worldwide.” The Southern African Hypertension Society says four out of ten adults worldwide have high blood pressure and only 50% are aware of it.