Carotid Artery Narrowing

Overview

Carotid artery narrowing (also called carotid artery stenosis) is a condition where the two main blood vessels in your neck that carry blood to your brain become partly blocked by a build-up of fatty material called plaque. This reduces blood flow to the brain and can increase the risk of a stroke.

This condition is fairly common, especially in people over 60. Many people live with mild narrowing and never have a stroke, but the risk goes up as the narrowing becomes more severe.

It is more common in older adults, and in people with high blood pressure, high cholesterol, diabetes, or a history of smoking. Men tend to develop it at a younger age than women, but the risk in women increases after menopause.

Symptoms

Common symptoms

• Most people with mild narrowing have no symptoms at all.
• Some people may notice a whooshing sound in their neck or ear (called pulsatile tinnitus).
• A doctor might hear a bruit (a soft blowing sound) when listening to the neck with a stethoscope.
• If symptoms occur, they are often due to a mini-stroke or stroke: sudden weakness or numbness on one side of the body, difficulty speaking, or loss of vision in one eye.

Symptoms in children

• Carotid artery narrowing is very rare in children.
• When it happens, it is usually due to an underlying genetic condition or inflammation of the blood vessels, not the usual age-related cause.
• Symptoms, if any, may be similar to those in adults, but children often have no symptoms and the condition is found during tests for another reason.

Symptoms in older adults

• Older adults may have more severe narrowing and a higher risk of stroke.
• They often also have other conditions such as high blood pressure, diabetes, or heart disease, which can increase the need for careful management.
• Symptoms may be harder to notice if an older person has age-related memory or communication changes, so family members are often the ones to notice sudden changes.

Causes

Main causes

• A slow build-up of fatty material (atheroma) inside the carotid artery.
• The plaque can harden, crack, or collect calcium, making the artery narrower and less flexible.
• If a piece of the plaque or a blood clot breaks off and travels to the brain, it can cause a stroke or mini-stroke.

Risk factors

• Smoking or long-term exposure to tobacco smoke
• High blood pressure (hypertension)
• High cholesterol levels in the blood
• Type 2 diabetes or prediabetes
• Being overweight or physically inactive
• A family history of stroke or heart disease
• Age (over 60 years)
• South Asian or African-Caribbean ethnicity is associated with a higher risk of stroke

When to see a doctor

See a doctor urgently if:

• Call your local emergency number immediately if you or someone else has sudden stroke-like symptoms, even if they go away quickly.
• Seek same-day medical care if you have a brief episode of weakness, speech trouble, or facial drooping that resolves completely (possible mini-stroke).

Book a routine appointment if:

• Make a routine appointment if you have concerns about your risk, such as a family history of stroke or high cholesterol.
• If your doctor has told you that you have a neck bruit during a previous exam, discuss whether you need further tests.
• If you have been diagnosed with narrowed carotid arteries, keep your regular check-ups to monitor the condition.

Diagnosis

Your doctor will ask about your medical history, your symptoms, and any risk factors. They may listen to the arteries in your neck with a stethoscope to check for a bruit. To confirm the diagnosis, you will need one or more imaging tests that look directly at the blood flow in your carotid arteries.

Tests that may be done

• Carotid ultrasound - uses sound waves to create an image of the artery and measure how fast blood flows through it.
• CT angiography (CTA) - a special X-ray that uses contrast dye to create detailed 3D pictures of the carotid arteries.
• MR angiography (MRA) - a magnetic resonance scan that produces high-resolution images of the arteries without using X-rays.
• Blood tests - to check cholesterol, blood sugar, and other risk factors.

What to expect at your appointment

Most tests are painless and done as an outpatient. For a carotid ultrasound, you will lie on your back with your neck slightly extended while a small probe is moved over the skin with gel. For CT or MR scans, you may be asked to fast for a few hours beforehand and to remove jewellery. You will be given clear instructions before the scan, and a specialist will explain the results to you afterward.

Treatment

Treatment focuses on preventing strokes by controlling the underlying risk factors. The exact treatment depends on how narrow the artery is, whether you have had symptoms, and your overall health. It may include lifestyle changes, medicines to lower cholesterol and blood pressure, and in some cases a procedure to widen or reopen the artery.

Self-care at home

• Stop smoking - this is one of the most effective things you can do.
• Stay physically active - aim for moderate exercise such as brisk walking, if your doctor says it is safe for you.
• Maintain a healthy weight and reduce belly fat.
• Limit alcohol intake to the recommended guidelines.
• Take all medicines exactly as prescribed, even if you feel well.

Medical treatments

There are no specific drug names included here because treatment should be tailored to you. Doctors commonly recommend medicines to lower cholesterol (statins), lower blood pressure (antihypertensives), and reduce the risk of blood clots (antiplatelet medicines such as aspirin or clopidogrel, when appropriate). These medicines work best when combined with lifestyle changes. It is important to discuss any side effects with your doctor rather than stopping a medicine on your own.

When is surgery considered?

If the narrowing is severe (for example, blocking more than 70% of the artery) and especially if you have already had a mini-stroke, a specialist may recommend a procedure. Carotid endarterectomy is an operation where the artery is opened and the fatty plaque is removed. Another option is carotid artery stenting, where a small mesh tube (stent) is placed to keep the artery open. These procedures are done by vascular specialists and are designed to lower the long-term risk of stroke.

Living with this condition

After a diagnosis, you will need regular check-ups to monitor your arteries and your risk factors. Many people continue to drive, work, and enjoy normal activities. After any surgical procedure, you may need to avoid heavy lifting or strenuous exercise for a few weeks - your surgeon will give you specific advice.

Lifestyle tips

• Follow a heart-healthy eating plan, such as the Mediterranean-style diet.
• Manage stress through relaxation techniques, mindfulness, or hobbies.
• Keep blood pressure and cholesterol in target ranges with medication and lifestyle changes.
• Attend follow-up appointments and blood tests as recommended.
• If you have diabetes, keep your blood sugar under control.

Diet and exercise

A balanced diet rich in vegetables, whole grains, fruits, legumes, and fish - and low in saturated fat, salt, and processed sugar - can help slow plaque build-up. Aim for at least 150 minutes of moderate-intensity aerobic activity (such as brisk walking, swimming, or cycling) each week, spread across the week. If you have not been active, check with your doctor before starting a new exercise programme.

Mental health and emotional wellbeing

Being diagnosed with a blood vessel condition can feel worrying, especially if you have already had a mini-stroke. It is completely normal to feel anxious, stressed, or low. Talk to your doctor if these feelings are affecting your sleep, appetite, or daily life. Your GP or local health service can connect you with talking therapies, such as cognitive behavioural therapy (CBT), to help you cope.

Prevention

Carotid artery narrowing can often be prevented or slowed by making heart-healthy choices early in life. The most important steps are not smoking, controlling blood pressure and cholesterol, managing diabetes, keeping a healthy weight, and staying active. Even if you already have some narrowing, these steps can stop it from getting worse.

Vaccines

Vaccinations are an important part of staying healthy when you have cardiovascular disease. Ask your doctor about the annual flu vaccine and the pneumonia vaccine if you are in an at-risk group. They help prevent infections that could put extra strain on your heart and blood vessels.

Screening programmes

Screening for carotid artery narrowing is not routinely offered to everyone in the UK. If you have significant risk factors (such as high blood pressure and smoking), a family history of stroke, or you had a mini-stroke, your doctor may arrange a carotid ultrasound to assess your risk.

Complications

If left untreated

• Stroke - a sudden loss of brain function caused by a blocked or bleeding blood vessel in the brain.
• Transient ischaemic attack (TIA) - a temporary blockage that causes stroke-like symptoms that resolve, but it is a serious warning sign.
• Permanent brain damage or disability after a major stroke.
• Sudden blockage of the carotid artery itself due to a blood clot forming at the site of the narrowing.

Long-term outlook

With early detection and appropriate treatment, the risk of stroke can be greatly reduced. Many people with carotid narrowing live full, active lives for many years. The most important thing is to work closely with your healthcare team to keep your blood vessels as healthy as possible. Small daily changes, along with any medicines your doctor prescribes, can make a real difference to your long-term health.

Find support

International organisations

• World Stroke Organization ↗

Local organisations

• NHS ↗ · United Kingdom
• Stroke Association (UK) ↗ · United Kingdom

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