Carotid artery disease is a disease in which waxy substance called plaque builds up inside the carotid arteries. You have two common carotid arteries, one on each side of your neck. They each divide into internal and external carotid arteries.
The internal carotid arteries supply oxygen-rich blood to your brain. The external carotid arteries supply oxygen-rich blood to your face, scalp, and neck.
Carotid artery disease is serious because it can cause a stroke, also called a "brain attack." A stroke occurs if blood flow to your brain is cut off.
Carotid artery disease is a major cause of stroke in the United States. Over time, plaque hardens and narrows the arteries. This may limit the flow of oxygen-rich blood to your organs and other parts of your body.
Atherosclerosis can affect any artery in the body. For example, if plaque builds up in the coronary arteries, a heart attack can occur. If plaque builds up in the carotid arteries, a stroke can occur.
A stroke also can occur if blood clots form in the carotid arteries. This can happen if the plaque in an artery cracks or ruptures. Blood cell fragments called platelets stick to the site of the injury and may clump together to form blood clots. Blood clots can partly or fully block a carotid artery.
A piece of plaque or a blood clot also can break away from the wall of the carotid artery. The plaque or clot can travel through the bloodstream and get stuck in one of the brain's smaller arteries. This can block blood flow in the artery and cause a stroke.
Carotid artery disease may not cause signs or symptoms until the carotid arteries are severely narrowed or blocked. For some people, a stroke is the first sign of the disease.
Source: National Heart, Lung, and Blood Institute; National Institutes of Health; U.S. Department of Health and Human Services.
Physicians are members of the medical staff at one of Baylor Health Care System's subsidiary, community or affiliated medical centers and are neither employees nor agents of those medical centers, The Heart Hospital Baylor Plano or Baylor Health Care System.