Symptoms of High Blood Pressure One of the most dangerous
aspects of hypertension is that you may not know that you have
it. In fact, nearly one-third of people who have high blood
pressure don't know it. The only way to know if your blood
pressure is high is through regular checkups. This is especially
important if you have a close relative who has high blood
pressure. If your blood pressure is extremely high, there may be
certain symptoms to look out for, including: