有症状的或无症状的颈动脉杂音是常见的听诊发现,特别在中年以上尤为多见。其最常见的病因是引起血管腔狭窄的动脉粥样硬化症。较难判定这种杂音是由颈内动脉狭窄引起或颈外动脉狭窄引起,或由二者同时狭窄引起。作者报告一例并介绍鉴别颈外动脉杂音的临床方法。 Symptomatic or asymptomatic carotid noise is a common finding of auscultation, especially in middle age or above. The most common cause is atherosclerosis that causes stenosis of the blood vessel. It is difficult to determine whether this murmur is caused by an internal carotid artery stenosis or external carotid artery stenosis, or by both stenosis caused. The authors report a case and introduce the clinical method of identifying external carotid artery noise.