Carotid artery disease (carotid artery stenosis) is a narrowing of the carotid arteries due to plaque in the arteries. As the arteries narrow and harden, it becomes more difficult for blood to flow through them. This can greatly increase the risk of stroke. Carotid artery disease treatments may include lifestyle changes, antiplatelet and cholesterol medications, and surgery. Follow the links below to find WebMD's comprehensive coverage about how carotid artery disease is caused, how to treat it, and much more.