Explanation:

World Health Day is celebrated on 7 April to mark the anniversary of the founding of WHO in 1948.
Each year a theme is selected for World Health Day that highlights a priority area of public health concern in the world. High blood pressure increases the risk of heart attacks, strokes and kidney failure.
Theme and Slogan of World Health Day 2019:
The theme and slogan of World Health Day 2019 is Universal health coverage: everyone, everywhere. The slogan is “Health for All”.