Clogged arteries happen when there is a build-up of plaque on the inner walls of your arteries. Arterial plaque can lower blood flow. In some cases, it can block the flow of blood altogether. Arteries that are clogged greatly heighten the chances of a stroke or heart attack.
Plaque that gathers on the inner walls of your arteries is made from a number of different substances that circulate in your blood. This includes cellular waste, cholesterol, fat, and calcium, as well as fibrin, which is a material involved in blood clotting. In response to the build-up of plaque, cells in your artery walls will multiply, secreting additional substances that can make the state of your clogged arteries even worse.
A condition called atherosclerosis can occur as these plaque deposits grow. This causes your arteries to harden and narrow. It’s unclear for sure what causes this. However, the process seems to result from damage to the arterial wall lining. There are a number of reasons why this may occur, yet some of the most common are as follows: