Having clogged arteries in the neck is a symptom of carotid artery disease where one or both of the carotid arteries has a blockage. This decreases blood flow to the brain, according to Healthline.
Carotid artery disease can be caused by a condition called atherosclerosis, which makes the arteries inflexible and narrow, as claimed by Healthline. A blockage can be caused by the accumulation of cholesterol, fat and other waste, which is called plaque. The risk factors that contribute to carotid artery disease are high blood pressure, high cholesterol, diabetes, obesity and smoking. An advanced stage of carotid artery disease can put a patient at risk for a stroke.