High blood pressure increases the heart's workload, and over time, this can cause the heart muscle to thicken.
As the heart pumps against elevated pressure in the blood vessels, the left ventricle becomes enlarged and the amount of blood pumped by the heart each minute goes down.
So, the heart muscle needs more oxygen cause works extra work, and, on the other side the blood output from heart decreases.
You'll have situation when your heart muscle lack blood oxygen and the symptoms of angina pectoris will develop.
High blood pressure also contributes to thickening of the blood vessel walls, aggravating possible atherosclerosis (cholesterol deposits in the blood vessels).
Controlling your blood pressure will be helpful.
But, you need to be checked for other risk factors, too(for ex.high cholesterol levels in your blood)
Best wishes, ben84!
Marija