High cholesterol can increase your risk of cardiovascular disease, such as heart disease and stroke. This is because it can cause fatty deposits (known as plaques) to build up inside your arteries. Over time, these make your arteries narrower, restricting the flow of blood to important organs.
If the surface of one of the plaques in your arteries breaks or bursts, it can cause a blood clot. This can completely block the blood supply to part of your heart (causing a heart attack), or brain (causing a stroke).
Please see the following links for information regarding cholesterol: