Carotid stenosis is a narrowing of the carotid artery, the large blood vessel in the neck that supplies the brain with blood. This narrowing is usually caused by a build-up of deposits on the artery wall and can significantly increase the risk of a stroke.
What happens with carotid stenosis?
The carotid artery is one of the most important blood vessels in the body. It carries oxygen-rich blood from the heart directly to the brain. When deposits made up of fat, calcium, and connective tissue build up on the inner wall of the artery, these are called plaques. They can gradually narrow the opening of the vessel. The greater the narrowing, the less blood reaches the brain. If the narrowed section becomes too large, or if part of the deposit breaks off, it can cause a sudden blockage in a brain vessel, leading to a stroke.
Causes and risk factors
In most cases, carotid stenosis develops as a result of atherosclerosis, which is a hardening and furring up of the arteries. Certain factors increase the likelihood of this happening. These include high blood pressure, raised cholesterol levels, diabetes, smoking, and a lack of physical activity. Age also plays a role, as deposits in the blood vessels tend to build up over time. Men are slightly more commonly affected than women. In rare cases, inflammation of the artery wall or congenital abnormalities may also be a contributing factor.
Symptoms: when does a narrowing become noticeable?
Carotid stenosis often goes unnoticed for a long time because it does not cause any symptoms. Symptoms only tend to appear when the narrowing is quite severe or when small blood clots form. Typical signs include sudden, short-lived episodes such as weakness or numbness on one side of the body, difficulty speaking, vision problems in one eye, or dizziness. These warning signs are known as a transient ischaemic attack (TIA). They are an important alarm signal, as they suggest the brain has briefly received too little oxygen. If the underlying cause is left untreated, a serious stroke can follow.
How is carotid stenosis diagnosed?
The most important test is an ultrasound scan of the carotid artery. This shows how narrow the artery has become and how quickly blood is flowing through it. If the results are unclear, or to help plan treatment more precisely, imaging of the blood vessels using a CT angiography or MRI angiography may be needed. Blood tests are also often carried out to check for risk factors such as raised cholesterol or diabetes. In some cases, a special measurement of blood pressure within the vessels may also be performed.
What does the diagnosis mean for everyday life?
A diagnosis of carotid stenosis can feel unsettling at first, especially if there are no symptoms. Many people wonder how serious it is and whether they need surgery straight away. Not every narrowing requires treatment. What matters most is how severe the narrowing is and whether any symptoms have already occurred. Mild narrowings are usually just monitored with regular check-ups. It is only when the stenosis is severe, or when warning signs such as a TIA have already occurred, that doctors recommend active treatment to reduce the risk of a stroke.
Treatment options for carotid stenosis
The choice of treatment depends on how severe the narrowing is and on each person's individual risk. For mild or moderate stenosis, the focus is on managing risk factors. This includes controlling blood pressure, lowering raised cholesterol, stopping smoking, and taking regular exercise. Medicines that help to thin the blood and reduce the risk of clots are often prescribed.
If the narrowing is very significant or symptoms have already appeared, two procedures may be considered. The first is surgery to remove the deposits from the carotid artery, known as a carotid endarterectomy. The second is the insertion of a stent, which holds the narrowed section open from the inside. Both approaches aim to restore good blood flow to the brain and prevent a stroke. Which method is more suitable depends on the individual findings and is discussed together with the treating specialists.
Common concerns and what you can do yourself
Many people feel anxious about the possibility of a stroke or surgery on the carotid artery. The good news is that with the right treatment and regular monitoring, the risk can be significantly reduced. It is important to look out for warning signs such as sudden weakness, difficulty speaking, or vision problems, and to seek medical help immediately if these occur. Even without symptoms, it is worth actively addressing risk factors. A balanced diet, enough physical activity, avoiding nicotine, and keeping blood pressure and blood sugar well controlled are all very important.
Anyone already taking medication should take it regularly and exactly as prescribed. Follow-up appointments with a doctor help to spot any changes early. If there is any uncertainty or new symptoms arise, it is always a good idea to ask questions rather than wait.
Living with carotid stenosis
In many cases, it is entirely possible to live well with carotid stenosis, provided the condition is identified and treated. Regular check-ups, a healthy lifestyle, and consistent management of risk factors all help to prevent complications. Modern medicine offers many ways to reduce the risk of a stroke and maintain quality of life. Being well informed and taking an active role in your own care can make a real difference to your vascular health.
