CHD is when the coronary arteries become too narrow. This tends to happen when cholesterol builds up on the artery walls over time. The build up is called plaque, and they are bumps which narrow the arterial passage, which results in reduced blood flow out of the heart.
Hypertension is another term for high blood pressure, a disease that could potentially lead to health problems like strokes, heart disease and death if left untreated. Normal blood pressure is defined as the force of the blood flow within the walls of the blood vessels.