High blood pressure is referred to as the “Silent Killer” because it often has no noticeable symptoms, but can cause serious damage to the cardiovascular system. High blood pressure means that the force of the blood pushing against the arterial wall is too high, which can weaken and damage the wall over time. This can lead to the accumulation of cholesterol and other substances on the inner lining of the wall, forming plaques. This condition is called atherosclerosis, and it narrows the space for blood flow and increases the risk of blood clots. A blood clot can block the blood supply to a vital organ, such as the heart or the brain, causing a heart attack or a stroke. Therefore, high blood pressure can silently increase the risk of life-threatening complications without causing any obvious signs or discomfort.