High blood pressure has no symptoms. It can damage the heart, blood vessels, kidneys and other parts of the body. If the blood pressure is too high, treatment is needed to prevent damage in body's organs.
Blood pressure is determined by the amount of blood your heart pumps and the amount of resistance to blood flow in your arteries. The more blood your heart pumps, the higher your blood pressure is.
On the other hand, high blood pressure can be easily detected. Once you know you have it, you can work with your doctor to control it.