Common carotid artery plaque ulcer refers to the formation of an ulcer at the site of the plaque due to tissue necrosis following the development of an atherosclerotic plaque in the common carotid artery. Common carotid artery plaque is due to carotid artery endothelial damage after lipid deposition on the surface of the damaged endothelium, hyperplastic fibrous tissue covering the lipid pool, forming a fibrous atherosclerotic plaque. When the lesion is severe, the fibrous plaque ulcerates, forming the so-called common carotid plaque ulcer. The plaque ulceration may be accompanied by plaque bleeding, necrosis, and calcification. People with common carotid plaque ulcers need to actively seek medical attention and choose a reasonable treatment plan under the guidance of a doctor to avoid an acute vascular event.