A 12 x 4 mm sized plaque in the right carotid artery is a relatively large plaque. Whether a carotid plaque is serious or not depends not only on the size of the plaque, but also on whether the plaque is stable and whether it has caused significant stenosis of the carotid artery. If the carotid plaque is stable, it is relatively harmless because it is covered by a thick fibrous layer, which makes it less likely to rupture. Some thin fibrous layer, unstable plaque consequences are serious, easy to rupture bleeding, the formation of blood clots, and then block the carotid artery, inducing cerebral infarction. In addition, it is also necessary to see whether the carotid plaque has led to significant narrowing of the carotid artery, or even occlusion. If the stenosis exceeds 50% or more, symptoms of dizziness and lightheadedness may occur. If the stenosis exceeds 70%, the risk of cerebral infarction is further increased, and it is necessary to be evaluated by a doctor to see if treatment such as endovascular stent implantation or surgical removal of the plaque is needed. When right-sided carotid plaque is present, it is recommended to visit a specialist in a timely manner to assess the condition and give targeted treatment under the guidance of a doctor.