Carotid artery stenosis

Overview

Carotid artery stenosis is a narrowing of the carotid arteries, the two large blood vessels on each side of your neck that carry blood to your brain. This narrowing is usually caused by a buildup of fatty deposits called plaque. If the narrowing gets severe, it can reduce blood flow to the brain and increase the risk of a stroke.

Carotid artery stenosis is fairly common, especially in people over age 60. The chance of having it increases with age and with certain health conditions like high blood pressure, high cholesterol, diabetes, and smoking.

It mostly affects older adults, particularly those with a history of smoking, high blood pressure, high cholesterol, diabetes, or a family history of atherosclerosis (hardening of the arteries). Men tend to get it slightly more often than women before age 75.

Symptoms

Common symptoms

• Many people with carotid artery stenosis have no symptoms at all.
• Sometimes the first sign is a transient ischemic attack (TIA or mini-stroke), which causes temporary symptoms like weakness on one side of the body, trouble speaking, or vision loss that lasts a few minutes to a few hours.

Symptoms in children

• Carotid artery stenosis is very rare in children. When it does occur, it is often due to a genetic condition or inflammation of the arteries. Symptoms may mimic those in adults, such as sudden weakness or speech problems.

Symptoms in older adults

• Older adults may notice subtle signs like temporary vision loss in one eye (like a curtain coming down) or brief episodes of dizziness or confusion, though these symptoms can have other causes.

Causes

Main causes

• Atherosclerosis – the buildup of fatty plaque inside the artery walls, which narrows the artery and can lead to blockages.
• In rare cases, inflammation of the arteries (arteritis), damage from radiation therapy to the neck, or a tear in the artery wall (dissection) can also cause narrowing.

Risk factors

• High blood pressure (hypertension)
• High cholesterol (especially LDL or 'bad' cholesterol)
• Smoking or tobacco use
• Diabetes
• Being overweight or obese
• Lack of physical activity
• Unhealthy diet (high in saturated fats, trans fats, and salt)
• Age (over 60)
• Family history of atherosclerosis or stroke

When to see a doctor

See a doctor urgently if:

• If you experience any stroke-like symptoms, even if they go away quickly, you should seek emergency medical help immediately. These could be signs of a TIA (mini-stroke).

Book a routine appointment if:

• If you have risk factors like high blood pressure, diabetes, or high cholesterol, talk to your doctor during a routine visit about whether you should be screened for carotid artery stenosis.
• If you are over age 65 and have never been checked, consider asking your doctor if a carotid ultrasound is right for you.

Diagnosis

Carotid artery stenosis is often discovered during a routine physical when your doctor listens to your neck with a stethoscope and hears a whooshing sound (bruit). If this happens, or if you have had a TIA, your doctor will order imaging tests to look at the carotid arteries.

Tests that may be done

• Carotid ultrasound – a painless test that uses sound waves to create pictures of the arteries and measure blood flow.
• CT angiography (CTA) – a specialized CT scan with contrast dye to see the arteries in detail.
• Magnetic resonance angiography (MRA) – an MRI scan that creates detailed images of blood vessels.
• Angiography – a dye test where a thin tube is inserted into an artery to take X-ray pictures (less common now).

What to expect at your appointment

Your doctor will explain the test results and tell you the percentage of narrowing (e.g., 50% or 70%). The degree of narrowing and your overall health will guide next steps. If the narrowing is mild, you may only need lifestyle changes and regular monitoring. If it is moderate to severe, your doctor may recommend medication or a procedure to open the artery.

Treatment

The main goal of treatment is to reduce your risk of stroke. This is done by managing the conditions that led to the buildup of plaque, such as high blood pressure, high cholesterol, and diabetes. Depending on how narrow the artery is and your symptoms, your doctor may recommend lifestyle changes, medications, or a procedure to open the artery.

Self-care at home

• Quit smoking – this is one of the most important steps you can take.
• Eat a heart-healthy diet low in saturated fats, trans fats, salt, and added sugars. Focus on fruits, vegetables, whole grains, lean proteins, and healthy fats.
• Get regular physical activity – aim for at least 150 minutes of moderate exercise per week, like brisk walking.
• Maintain a healthy weight.
• Limit alcohol to moderate amounts (no more than one drink per day for women, two for men).

Medical treatments

Your doctor may prescribe medications to help control blood pressure, lower cholesterol, and prevent blood clots. These treatments are aimed at reducing the risk of stroke. It is important to take them exactly as prescribed and to attend regular follow-up appointments. In some cases, a daily low-dose aspirin may be recommended, but only under a doctor's guidance.

When is surgery considered?

If the carotid artery is severely narrowed (often 70% or more) and you have had symptoms like a TIA or stroke, your doctor may recommend a procedure to open the artery. The two main options are carotid endarterectomy (surgical removal of the plaque) and carotid artery stenting (placing a mesh tube to hold the artery open). Your doctor will discuss the risks and benefits with you.

Living with this condition

Living with carotid artery stenosis means being aware of your risk factors and staying on top of your health. Most people can continue their normal activities while managing the condition with lifestyle changes and medications. Learn the warning signs of a stroke so you can act quickly if they appear.

Lifestyle tips

• Take your medications exactly as prescribed – they help prevent stroke.
• Monitor your blood pressure at home if your doctor recommends it.
• Keep all medical appointments, including regular ultrasounds to check the narrowing.
• Tell your doctor about any new symptoms, such as temporary weakness, vision changes, or dizziness.

Diet and exercise

Focus on a diet rich in fruits, vegetables, whole grains, and lean proteins like fish and poultry. Limit red meat, processed foods, and salty snacks. Regular exercise, like walking, swimming, or cycling, helps control blood pressure, cholesterol, and weight. Talk to your doctor before starting any new exercise program.

Mental health and emotional wellbeing

A diagnosis of narrowed neck arteries can be worrying, but remember that treatment is very effective at preventing stroke. Many people live with this condition for years without problems. If you feel anxious or depressed, talk to your doctor or a counselor. It can help to connect with others who have similar health issues through support groups.

Prevention

You cannot always prevent carotid artery stenosis, especially if you have a strong family history, but you can greatly lower your risk by adopting a healthy lifestyle. Quitting smoking, controlling blood pressure and cholesterol, eating well, staying active, and managing diabetes are proven ways to prevent or slow the progression of the disease.

Screening programmes

Screening for carotid artery stenosis is not recommended for everyone. Your doctor may suggest it if you have risk factors such as high blood pressure, diabetes, or a history of smoking, especially if you have had a stroke or TIA, or if your doctor hears a bruit in your neck.

Complications

If left untreated

• Stroke – the most serious complication, which can cause permanent brain damage, disability, or death.
• Transient ischemic attack (TIA) – a 'mini-stroke' that is a warning sign of a future stroke.
• Complete blockage of the carotid artery (carotid artery occlusion) – this can happen if the narrowing becomes severe, but even a complete blockage may not cause symptoms if a replacement blood supply has developed (collateral circulation).

Long-term outlook

The outlook for people with carotid artery stenosis is generally good if the condition is detected early and managed properly. With lifestyle changes and medical treatment, the risk of stroke can be greatly reduced. Even if you need surgery, most people do well and can return to normal activities. Staying proactive about your health is the best way to maintain a positive outlook.

Find support

International organisations

• Stroke Association (UK)
• American Stroke Association
• World Stroke Organization

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