Carotid artery disease occurs when the carotid arteries become narrowed or blocked. These arteries provide the majority of the blood supply to the brain, and are located on each side of the neck. Carotid artery disease occurs when fatty material called plaque builds up inside the arteries. The plaque may slowly block or narrow the carotid artery, or more seriously it can cause a clot to form suddenly. A clot that completely blocks the artery or breaks off and travels to the brain can lead to a potentially deadly or debilitating stroke. Sometimes the first indication of the disease is the stroke, so Kane Chang, MD, vascular surgeon, explains how to prevent Carotid artery disease, the steps to diagnose it, and the advanced treatments now available.