Content Map Terms

Carotid Artery Disease

Condition Basics

What is carotid artery disease?

A carotid artery on each side of the neck supplies blood to the brain. Carotid artery disease occurs when a substance called plaque builds up in either or both arteries. The buildup can narrow the artery and reduce the blood flow to your brain. This can raise your chance of a stroke or transient ischemic attack (TIA).

The narrowing in an artery is called stenosis. The more narrow an artery becomes, the greater the risk of stroke or TIA.

What causes it?

Plaque can build up in your carotid arteries over time. Plaque may form because:

  • You smoke.
  • You have high blood pressure.
  • You have high cholesterol.
  • You have diabetes.
  • You have a family history of hardening of the arteries

What are the symptoms?

Many people have no symptoms. For some people, a transient ischemic attack (TIA) or stroke is the first sign of the disease.

If you have any of these symptoms of a TIA or stroke, call 911 or other emergency services right away.

  • Sudden numbness, tingling, weakness, or loss of movement in your face, arm, or leg, especially on only one side of your body.
  • Sudden vision changes.
  • Sudden trouble speaking.
  • Sudden confusion or trouble understanding simple statements.
  • Sudden problems with walking or balance.
  • A sudden, severe headache that is different from past headaches.

How is it diagnosed?

Your doctor may listen to your neck for a sound called a bruit (pronounced "broo-EE"). This whooshing sound is often heard when a carotid artery is narrowed (stenosis).

If your doctor thinks you may have stenosis, you will have a Doppler ultrasound. This test uses sound waves to show how blood flows through an artery or vein. You also may have a CT angiogram or a magnetic resonance angiogram (MRA).

Routine tests for carotid artery disease are not recommended for everyone. Experts recommend them only for people who have symptoms.footnote 1

How is carotid artery disease treated?

The goal of treatment is to lower your risk of a transient ischemic attack (TIA) or a stroke. Treatment depends on whether you have symptoms and how much of your arteries are blocked. You probably will take medicine. You also will be encouraged to make healthy lifestyle changes. Some people have procedures to lower their risk.


You will likely take aspirin or another medicine to prevent blood clots. You will likely also take medicine to lower cholesterol.

Work with your doctor to manage other health problems, such as high blood pressure and diabetes.

Avoid colds and influenza (flu). Get the flu vaccine every year.

Lifestyle changes

Heart-healthy lifestyle changes can help lower your risk of stroke.

  • Quit smoking. Avoid second-hand smoke too.
  • Eat heart-healthy foods.
  • Be active. Ask your doctor what type of exercise is safe for you.
  • Stay at a healthy weight. Lose weight if you need to.

Regular ultrasounds

If you have some stenosis-but you don't have symptoms-your doctor may want you to have routine ultrasounds. This is to see if the narrowing in your arteries is getting worse.

Surgery or stenting

Surgery in the arteries is called carotid endarterectomy. The doctor makes a cut in the neck and takes the plaque out of the artery.

Some people have a procedure called stenting. A doctor threads a thin tube through an artery in the groin and up to the carotid artery in the neck. Then he or she uses a tiny balloon to enlarge the narrowed part of the artery and places a stent to keep the artery open.

Surgery and stenting have a risk of serious problems, such as stroke or heart attack. People who are at increased risk for problems from surgery or stenting include those who have severe heart disease or other serious health problems. You and your doctor can decide together if you should have a procedure.

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  1. U.S. Preventive Services Task Force, et al. (2021). Screening for asymptomatic carotid artery stenosis: US Preventive Services Task Force recommendation statement. JAMA, 325(5): 476–481. DOI: 10.1001/jama.2020.26988. Accessed April 21, 2020.


Current as of:
April 29, 2021

Author: Healthwise Staff
Medical Review:
E. Gregory Thompson MD - Internal Medicine
Martin J. Gabica MD - Family Medicine
Adam Husney MD - Family Medicine
Robert A. Kloner MD, PhD - Cardiology