Health condition
Hypertrophic cardiomyopathy
Hypertrophic cardiomyopathy (HCM) is an inherited condition in which heart muscle thickens abnormally. Most people live normal lifespans, but assessment of obstruction and rhythm risk is essential.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Possible symptoms: breathlessness, chest pain, palpitations or fainting - especially during exertion - though many people have no symptoms
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Seek urgent assessment for exertional blackouts, or if a first-degree relative has HCM or died suddenly and unexpectedly
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Specialist: a consultant cardiologist usually leads assessment and treatment
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Options include beta-blockers, the newer myosin inhibitor mavacamten for obstructive HCM, septal reduction procedures, defibrillators for those at risk, and family screening
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
HCM affects roughly 1 in 500 people and is usually caused by a gene variant affecting the heart’s contractile proteins. The thickened muscle can obstruct blood leaving the heart, stiffen filling and generate abnormal rhythms. Severity varies enormously - many people are picked up incidentally and need little more than surveillance.
Diagnosis and treatment routes
Specialist care involves echocardiography with provocation, cardiac MRI, rhythm monitoring and a formal sudden-death risk assessment to decide who needs an implantable defibrillator. Drug treatment has advanced with mavacamten, and first-degree relatives are offered screening from adolescence. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant cardiologist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Hypertrophic cardiomyopathy.
Quick, plain-English answers to what people ask us most.
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What is Hypertrophic cardiomyopathy?
Hypertrophic cardiomyopathy is a health condition that affects how part of the body functions, and can range in severity from mild to significant depending on the individual. A clinician can assess your specific situation and explain what it means for you. Understanding the basics helps you ask the right questions at your appointment.
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Why does hypertrophic cardiomyopathy happen?
There are usually several contributing factors behind hypertrophic cardiomyopathy, and it's not always possible to pin down a single cause without proper assessment. Your doctor will consider your symptoms, history, and any relevant investigations to build a clearer picture. This helps make sure treatment is targeted appropriately.
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What does hypertrophic cardiomyopathy feel like?
Symptoms can vary from mild and barely noticeable to more significant and disruptive, depending on severity and individual factors. Common features often include changes that affect comfort, function, or general wellbeing in the affected area or system. If you're experiencing symptoms that concern you, it's worth having them assessed rather than guessing.
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How worried should I be about hypertrophic cardiomyopathy?
Most cases can be managed effectively once properly assessed and treated, though how serious it is depends on individual circumstances and how early it's picked up. Getting a professional opinion helps rule out anything more concerning and puts your mind at ease either way. Don't hesitate to seek advice if something feels wrong.
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Is hypertrophic cardiomyopathy hereditary or genetic?
Some cases have a genetic or family component, while others are linked more to lifestyle, environment, or other health conditions. Having a family history may increase your risk slightly, but it doesn't mean you'll definitely develop it. A clinician can advise whether genetic factors seem relevant in your particular case.
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Can hypertrophic cardiomyopathy be prevented?
Treatment can often reduce symptoms significantly and, in some cases, resolve the underlying problem entirely, though this isn't guaranteed for everyone. Prevention strategies, where they exist, usually focus on managing risk factors and general health. A tailored discussion with your doctor will give you the clearest picture for your circumstances.
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How is hypertrophic cardiomyopathy treated?
Treatment options range from conservative measures such as lifestyle changes, medication, or physiotherapy through to more involved interventions in more severe or persistent cases. The right approach depends on the underlying cause, severity, and how it's affecting you. Your specialist will talk through the pros and cons of each option that's relevant to you.
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What is the typical recovery time for hypertrophic cardiomyopathy?
Some people recover within a matter of weeks, while others find it becomes a longer-term or recurring issue that needs ongoing management. Following your treatment plan closely tends to support the best possible recovery. Ask your specialist for a realistic timeline based on your own results and progress.
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When is a specialist opinion or surgery needed for hypertrophic cardiomyopathy?
A specialist opinion is generally recommended if symptoms persist despite initial treatment, if they're severe, or if there's uncertainty about the diagnosis. Surgery or more invasive treatment is usually reserved for cases where conservative measures haven't worked. Your GP can refer you on if they feel a specialist review would be helpful.
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When should I see a doctor about hypertrophic cardiomyopathy?
See a doctor if symptoms are persistent, worsening, or affecting your daily life, or sooner if you have any red-flag symptoms your GP has warned you about. NHS routine referrals for this can take anywhere from around 20 to 45+ weeks depending on your local waiting list, while most private consultants can offer an initial appointment within about 2 weeks.