Cardiomyopathy in Singapore — Types, Symptoms & Treatment

Written & reviewed by the BestDoctors.sg editorial team · Last updated 1 Sep 2026 · General information, not medical advice

At a glance

• Cardiomyopathy is a group of diseases of the heart muscle that change how well the heart pumps or fills with blood.
• The main types are dilated, hypertrophic and restrictive cardiomyopathy, each affecting the muscle in a different way.
• It can cause heart failure, rhythm problems and, importantly, a risk of sudden cardiac events — especially in hypertrophic cardiomyopathy.
• Many forms are inherited, so screening first-degree relatives is often advised.
• Call 995 for severe breathlessness, chest pain, fainting or collapse.

What it is

Cardiomyopathy means “heart muscle disease”. The heart is a muscular pump, and in cardiomyopathy the muscle itself becomes weakened, thickened or stiff, so it cannot pump blood around the body — or fill with blood between beats — as effectively as it should. This is different from problems with the coronary arteries, the heart valves or the blood pressure, although those conditions can sometimes contribute to muscle damage over time. Cardiomyopathy can develop slowly over years or, occasionally, appear suddenly after an illness such as a viral infection. Some people feel completely well and are diagnosed only by chance; others gradually develop symptoms of a failing heart. Because several forms run in families, a diagnosis in one person often has implications for their relatives.

The main types

Cardiomyopathy is grouped according to how the heart muscle changes.

• Dilated cardiomyopathy — the main pumping chamber (the left ventricle) stretches and enlarges, and the muscle wall becomes thin and weak. The heart pumps less forcefully, which can lead to heart failure and rhythm disturbances. Causes include genetic factors, previous viral infection, heavy alcohol use, certain medicines, and problems around pregnancy.
• Hypertrophic cardiomyopathy — the heart muscle becomes abnormally thick. This can obstruct the flow of blood leaving the heart and can trigger dangerous rhythm problems. It is an important cause of sudden cardiac events in young people and athletes, and it is frequently inherited.
• Restrictive cardiomyopathy — the muscle becomes stiff and rigid, so the chambers cannot relax and fill properly between beats, even though the pumping action may look near-normal. It is the least common type and may be linked to conditions where abnormal substances build up in the heart muscle.

Doctors also recognise other, less common patterns, and some people do not fit neatly into a single category. A cardiologist can identify the type, which guides both treatment and family screening.

Symptoms

Many people have no symptoms in the early stages, particularly with hypertrophic cardiomyopathy. As the condition progresses, it can cause:

• Breathlessness — on exertion, at rest, or when lying flat;
• Fatigue and reduced exercise tolerance;
• Ankle, foot or leg swelling, and sometimes a bloated abdomen;
• Palpitations — a fluttering, racing or irregular heartbeat;
• Chest discomfort, especially with exertion;
• Dizziness, light-headedness or fainting.

Sometimes cardiomyopathy is first suspected during a routine health check, an unrelated test, or when a family member is screened. Fainting during or straight after exercise deserves prompt assessment, because it can signal a rhythm problem.

Causes

Cardiomyopathy has many possible causes, and sometimes no cause is found. Recognised contributors include inherited genetic changes; long-standing high blood pressure; a previous heart attack that has scarred the muscle; viral infections that inflame the heart; heavy or prolonged alcohol use; certain recreational drugs and some cancer treatments; thyroid and other hormone disorders; and rare conditions where abnormal proteins or iron accumulate in the muscle. Pregnancy can occasionally trigger a form of dilated cardiomyopathy. Where the cause is genetic, the underlying change can be passed from parent to child, which is why a family assessment matters.

Who is at risk

You may be at higher risk if you have:

• A family history of cardiomyopathy, unexplained heart failure at a young age, or sudden cardiac death — many types are inherited;
• Long-standing high blood pressure or a previous heart attack;
• Heavy alcohol intake or use of certain drugs;
• Had a viral illness affecting the heart;
• Certain hormonal, metabolic or storage conditions;
• Received particular chemotherapy or radiotherapy treatments.

Because inherited forms are common, doctors pay close attention to the family tree. If an inherited type is confirmed, first-degree relatives — parents, brothers, sisters and children — are usually encouraged to be assessed, even if they feel well.

How it is diagnosed

A doctor will ask about symptoms, exercise capacity, alcohol use and family history, and examine the heart, lungs and for signs of fluid retention. Investigations may include:

• An ECG to record the heart’s electrical activity and look for strain, thickening or rhythm changes;
• An echocardiogram — an ultrasound of the heart — which is the key test for showing the size, thickness and pumping strength of the chambers;
• A cardiac MRI, which gives detailed images of the muscle and can show scarring or infiltration;
• Blood tests to check heart-strain markers and look for underlying causes;
• Rhythm monitoring over 24 hours or longer, and sometimes an exercise test, to detect arrhythmias;
• Genetic testing and family screening where an inherited type is suspected.

In Singapore, a GP or polyclinic doctor can arrange initial tests and refer to a cardiologist; specialist and inherited-heart-disease services are available at centres such as the National Heart Centre Singapore.

Complications

The main complications of cardiomyopathy are:

• Heart failure — when the weakened or stiff muscle cannot meet the body’s needs, causing breathlessness, fatigue and fluid build-up;
• Abnormal heart rhythms (arrhythmias) — including atrial fibrillation and, more seriously, fast rhythms arising from the ventricles;
• Blood clots — which can form when blood flow is sluggish and may travel to other parts of the body;
• Heart valve problems, as the enlarging or thickening muscle affects how the valves work;
• Sudden cardiac death — an important risk, particularly in hypertrophic cardiomyopathy, when a dangerous ventricular rhythm causes the heart to stop.

These risks are one reason why regular specialist follow-up matters, so that problems can be spotted and managed before they become dangerous.

Treatment

There is often no cure, but treatment can control symptoms, slow progression and reduce the risk of serious events. A cardiologist tailors the plan to the type and severity, and it may include:

• Medicines — classes of drugs that help the heart pump more efficiently, ease its workload, control the rhythm, prevent clots, or remove excess fluid. The right combination depends on the type of cardiomyopathy;
• Device therapy — a pacemaker to regulate slow rhythms, or an implantable cardioverter defibrillator (ICD) that can detect and correct a life-threatening rhythm, protecting people judged to be at higher risk of sudden cardiac death;
• Treating rhythm problems — with medicines or procedures such as catheter ablation;
• Procedures for obstruction in hypertrophic cardiomyopathy, to reduce the thickened muscle that blocks blood flow;
• Lifestyle measures — avoiding excess alcohol, managing blood pressure and weight, staying active within limits advised by your specialist, and not smoking;
• Advanced options — in severe heart failure that no longer responds to other treatment, a small number of people may be considered for mechanical support or, rarely, a heart transplant.

Any drug decisions, including which classes are suitable and their doses, are made by a doctor, as the safest choice varies with the type of cardiomyopathy.

Living with it

Most people with cardiomyopathy live active lives with the right care. Ongoing management usually involves regular reviews with echocardiograms and rhythm checks so that treatment can be adjusted over time. Activity advice should come from your specialist — some forms, particularly hypertrophic cardiomyopathy, may need certain intense or competitive sports to be limited, while gentle regular activity is often encouraged. Taking medicines consistently, keeping alcohol within safe limits, managing blood pressure and attending follow-up appointments all help. It is also worth telling your doctor about new or worsening breathlessness, swelling or palpitations early. Where an inherited type is found, family screening of first-degree relatives is an important part of care, and can pick up the condition in people before they have any symptoms. HealthHub provides Singapore-specific information on heart conditions and healthy living.

When to see a doctor

See a GP, polyclinic doctor or cardiologist if you have unexplained breathlessness, palpitations, chest discomfort, fainting, or a family history of cardiomyopathy or sudden cardiac death, so the heart muscle can be assessed and, if needed, relatives screened.

Call 995 or go to the nearest emergency department if you have:

• Severe or sudden breathlessness;
• Chest pain or tightness;
• Fainting or collapse;
• A racing, irregular heartbeat with dizziness or breathlessness.

If someone collapses and is not breathing normally, call 995 and start CPR.

Common questions

Is cardiomyopathy inherited?

Some types, particularly hypertrophic cardiomyopathy, can be inherited, so screening first-degree relatives is often recommended even when they feel well.

Can you live a normal life with cardiomyopathy?

Many people do well with treatment and regular follow-up; the outlook depends on the type, the severity and how well it is controlled.

Is cardiomyopathy the same as a heart attack?

No. A heart attack is caused by a blocked artery starving the muscle of blood; cardiomyopathy is a disease of the heart muscle itself — though a previous heart attack can lead to it.

Can exercise be dangerous with cardiomyopathy?

It depends on the type. Some forms need intense or competitive sport to be limited, while gentle regular activity is often beneficial. Always follow the specific advice of your cardiologist.

Does cardiomyopathy always cause symptoms?

No. Many people, especially early on, have no symptoms and are found only on a test or during family screening. This is one reason relatives are assessed when an inherited type is diagnosed.

Related guides

• Heart failure
• Heart arrhythmias
• Heart screening
• Best cardiologists in Singapore
• Myocarditis
• Sudden Cardiac Arrest
• Understanding Heart Failure: Symptoms & Diagnosis
• Living with Heart Failure
• Living with an ICD (Singapore)

Sources

• Singapore Heart Foundation — cardiomyopathy.
• HealthHub Singapore — heart conditions.
• National Heart Centre Singapore — cardiomyopathy.

This article is for general information only and does not replace a consultation with a qualified doctor. If you have chest pain, breathlessness or fainting, seek urgent medical care.