Diseases & care
Marfan syndrome explained
Marfan syndrome is an inherited condition that affects connective tissue — the material that supports and holds together many parts of the body. Because connective tissue is so widespread, Marfan syndrome can affect several areas, especially the heart and main blood vessel, the eyes, and the bones and joints. People with Marfan syndrome are often tall and slim with long limbs and fingers. With modern care and monitoring, most people live full lives. This guide explains what Marfan syndrome is, its main features, how it is diagnosed and managed on the NHS, and why regular heart checks matter. It is general education, not a substitute for specialist advice.
Education and reference only. This article explains how treatments work in plain language — it contains no doses and is not a substitute for advice from your doctor or pharmacist. Always discuss your own treatment with a qualified clinician.
What Marfan syndrome is
Marfan syndrome is caused by a genetic change that affects how the body makes connective tissue, the strong, flexible material that supports skin, bones, blood vessels, the eyes and other structures. Because this tissue is found throughout the body, the condition can affect several systems, though how much varies from person to person, even within the same family. Marfan syndrome is usually inherited, meaning it can be passed from parent to child; sometimes it appears in a person with no family history because of a new genetic change. It is present from birth, even though some features become more obvious with growth. It is not caused by anything a person did. Understanding that it affects connective tissue helps explain why the heart, eyes and skeleton can all be involved.
How it affects the body
The features people often notice are physical: being tall and slender, with long arms, legs, fingers and toes, a long narrow face, and sometimes a curved spine or a chest that sinks in or sticks out. Flexible joints and flat feet are common. But the most important effects are on the heart and main artery, the aorta, which can become stretched or widened over time; this is why heart monitoring is central to care. The eyes are also commonly affected, including the lens moving out of place and short-sightedness, so regular eye checks are important. Not everyone has every feature, and the condition ranges from mild to more significant. Recognising the overall pattern — tall build with heart and eye involvement — is what points doctors towards the diagnosis.
Why heart monitoring matters
The most serious concern in Marfan syndrome involves the aorta, the large blood vessel that carries blood from the heart to the body. In Marfan syndrome the aorta can gradually widen, and if it becomes too stretched there is a risk of a tear, which is dangerous. This is why regular heart scans, usually ultrasound of the heart (echocardiograms), are a key part of care — they let doctors watch the aorta over time and act early. Medicines may be used to reduce strain on the aorta, and if it widens beyond a certain point, planned surgery can be done to protect it. People with Marfan syndrome are usually advised about which activities are safe, often avoiding intense competitive or heavy strenuous exercise. Following this monitoring and advice is one of the most important things for staying well.
How it is diagnosed and managed
Diagnosis is based on a person's physical features, family history, and specialist assessments of the heart and eyes, and it can be confirmed with a genetic (DNA) test. Care is usually coordinated by a specialist team and may involve heart, eye and bone specialists. Management focuses on regular monitoring — especially heart scans and eye checks — and treating any problems early. Medicines may help protect the aorta, glasses or other treatment help with eyesight, and physiotherapy or, occasionally, surgery may help skeletal problems. Because Marfan syndrome is inherited, families may be offered genetic counselling to understand the chance of passing it on and whether relatives should be checked. A clear, coordinated plan and regular follow-up are the foundations of good care.
Living with Marfan syndrome
With regular monitoring and modern treatment, most people with Marfan syndrome live full and active lives. The keys are attending heart and eye appointments, taking any prescribed medicines, and following advice about exercise and activity to reduce strain on the aorta. It is important to tell healthcare teams about the diagnosis, particularly before surgery, pregnancy or dental procedures, and to seek prompt advice for new symptoms. Sudden severe chest, back or tummy pain should be treated as an emergency — call 999 — because of the small risk of an aortic tear. Support groups and charities offer helpful information and connection. Because the condition can be passed on, some people talk to a genetics service about what it means for their family. Staying engaged with your specialist team is central.
In short
Key takeaways
- Marfan syndrome is an inherited connective tissue condition affecting mainly the heart and aorta, the eyes, and the bones and joints.
- People are often tall and slim with long limbs and fingers, but features range from mild to more significant.
- Regular heart scans matter because the aorta can widen over time, with a risk of a dangerous tear.
- Care involves a specialist team, monitoring, medicines to protect the aorta, eye checks, and advice about safe activity.
- This is general education only — tell healthcare teams about the diagnosis before procedures, and call 999 for sudden severe chest, back or tummy pain.
Answers
Frequently asked questions
Why do people with Marfan syndrome need regular heart checks?
Because Marfan syndrome affects the aorta, the large blood vessel that carries blood from the heart, and this vessel can gradually widen over time. If it becomes too stretched, there is a risk of a tear, which is dangerous. Regular heart scans, usually echocardiograms, let doctors watch the aorta and act early — for example with medicines to reduce strain or, if needed, planned surgery. Following this monitoring and any advice about avoiding intense strenuous exercise is one of the most important parts of staying well with Marfan syndrome.
Is Marfan syndrome inherited?
Usually, yes. Marfan syndrome is a genetic condition that can be passed from parent to child, so it often runs in families. Sometimes it appears in a person with no family history because of a new genetic change. It is present from birth, even if some features only become obvious with growth, and it is not caused by anything a person did. Because it can be passed on, families are often offered genetic counselling to understand the chance of inheritance and whether relatives should be checked by a specialist.
Can people with Marfan syndrome exercise?
Many can, but usually with some guidance. People with Marfan syndrome are often advised to avoid intense competitive sport and heavy, strenuous exercise that puts extra strain on the aorta, while gentler, moderate activity is generally encouraged. The right advice depends on the individual and their heart assessments, so it should come from the specialist team who know your details. Following this advice helps reduce strain on the aorta. If you are unsure what is safe for you, ask your heart specialist before taking up a new or vigorous activity.
Sources
Where this is drawn from
- NHS. Marfan syndrome: overview and management. 2024.
- The Marfan Association UK. Living with Marfan syndrome. 2023.
- European Society of Cardiology. Guidelines for the management of aortic disease. 2024.
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