Mostly, high blood pressure (also called hypertension) shows no symptoms at all in the beginning. This means that people with high blood pressure can get damage to their heart, kidneys, eyes, and circulation without feeling it at all. Symptoms appear after it has caused some damage already.
If you have high blood pressure, you are likely to develop coronary artery disease, because high blood pressure puts added force on the artery walls. With time, this extra force can damage the arteries, making them more vulnerable to the narrowing and plaque buildup.