Your arteries are the carriers of blood from your heart to all the parts of your body. Generally, these arteries are flexible and elastic. But in atherosclerosis, your arteries become thick and stiff. Atherosclerosis refers to the building up of fats, cholesterol, etc. inside your arteries, forming plaques. These plaques could restrict the flow of blood by narrowing your arteries. Sometimes, the plaques could also rupture and burst, forming a blood clot. Even though it is a cardiac problem, an artery in any part of your body could be affected by atherosclerosis. This condition is both treatable and preventable.