World Hypertension Day 2021: Date, theme, history and important facts World Hypertension Day is observed every year to raise awareness about the silent killer. The theme for WHD 2021 is Measure Your Blood Pressure, Control It, Live Longer. advertisement Representational Image World Hypertension day is celebrated on May 17 every year. It is observed annually to raise awareness about the symptoms of hypertension. The main aim of World Hypertension Day is to educate the public and increase awareness of hypertension, which is also commonly known as high blood pressure. Hypertension or high blood ...