What it is
An enlarged heart means the heart's walls have thickened or its chambers have stretched larger than expected. It is often noticed on an imaging test such as a chest X-ray or echocardiogram. Many things can lead to it, including long-standing high blood pressure, valve problems, certain infections, some medications or substances, and other health conditions.
In some people, an enlarged heart genetic cause may be involved. Changes in genes that build and run the heart muscle can lead to inherited forms of cardiomyopathy, such as dilated or hypertrophic cardiomyopathy. These conditions can run in families, though not everyone who carries a gene change develops symptoms, and the pattern can differ from person to person.
Genetic heart testing looks for gene variants linked to inherited heart conditions. It shows risk or carrier status. It does not diagnose heart disease on its own, and results must be read alongside personal and family history, a physical exam, imaging and bloodwork by a qualified cardiologist, electrophysiologist or genetic counselor.
How it’s traditionally been approached
Traditionally, evaluation of an enlarged heart starts with the basics: a conversation about symptoms and health history, a physical exam, and common tests such as an electrocardiogram, echocardiogram, and bloodwork. The goal is to understand what is causing the change in the heart's size or shape.
Family history has long been an important clue. Clinicians often ask about relatives with heart failure, rhythm problems, sudden unexplained death at a young age, or a known cardiomyopathy. Sometimes relatives are offered heart screening, such as imaging or an electrocardiogram.
More recently, genetic heart testing has been added to the conversation for some people when an inherited cause is suspected. Whether testing is appropriate is a decision made by a licensed clinician after an evaluation. Approaches differ between practices, and many people have an enlarged heart without any genetic explanation.
How the right cardiologist may help
The right cardiologist, often one with experience in inherited cardiomyopathy, may help sort out whether an enlarged heart appears related to genes or to other causes. A first visit generally involves reviewing your symptoms, medical history, and family tree, and may include an exam and imaging or other tests.
If genetic heart testing is discussed, a cardiologist or genetic counselor may explain what the test can and cannot tell you. They may also talk through how results could affect you and your relatives. Genetic counseling before and after testing is generally recommended, and genetic counselor licensing varies by state.
Questions you might bring: Could my enlarged heart have a genetic cause? Is genetic heart testing appropriate for me? What does a negative or uncertain result mean? Should family members be screened? How might testing affect life, disability or long-term-care insurance? What will my insurer cover? Ask your provider what makes sense for your situation.
The whole-person view
Body, mind and stress affect each other. Learning that your heart is enlarged, or that a condition may run in your family, can bring worry, guilt or uncertainty, and stress can in turn make symptoms feel more intense. Looking at the whole person, including sleep, movement your clinician approves, relationships and emotional health, is part of living well alongside a heart condition.
Some people find body-based support helpful, such as the approaches listed through Somatic Experiences. Others value talking with a licensed professional through Therapists.plus, especially when family health news feels heavy. These can sit alongside, never replace, care from your cardiologist.
Somatic Experiences: nervous system regulation →Somatic Experiences: embodiment and movement →Therapists.plus: anxiety panic and ocd →Therapists.plus: mind body connection →
Keep in mind
- This page is educational only and is not medical advice; licensed professionals should guide all diagnosis and care.
- A negative genetic result does not rule out risk, and a variant of uncertain significance is not a diagnosis.
- GINA protects against genetic discrimination in US health insurance and employment, but does not cover life, disability or long-term-care insurance, so ask about those before testing. Coverage for testing and procedures varies by insurer, state and diagnosis.
- If a disease-causing variant is found, cascade (family) testing may be offered to relatives. For emergencies such as chest pain, fainting or severe shortness of breath, call 911; in a crisis, call or text 988.
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Frequently asked questions
Can an enlarged heart be caused by genetics?
Yes, in some people an enlarged heart has a genetic cause, such as an inherited cardiomyopathy. Many other causes exist too, including high blood pressure and valve problems. A cardiologist can evaluate which factors may apply to you.
What is genetic heart testing for an enlarged heart?
Genetic heart testing is a test that looks for gene variants linked to inherited heart conditions. It shows risk or carrier status and does not diagnose disease by itself. A qualified cardiologist or genetic counselor interprets it with your history, exam, imaging and bloodwork.
If my genetic test is negative, can I rule out an inherited heart condition?
No, a negative result does not rule out risk. Current tests cannot detect every possible cause, and not every gene involved is known. Your clinician will consider your results alongside your whole health picture.
What does a variant of uncertain significance mean?
A variant of uncertain significance means science cannot yet say whether the gene change is harmful. It is not a diagnosis. Your care team may revisit its meaning over time and consider family history and other findings.
Should my family be tested if I have an inherited enlarged heart?
Possibly. If a disease-causing variant is found, cascade (family) testing may be offered to relatives to see who carries it. Your cardiologist or genetic counselor can explain who may benefit and what screening might look like.
Will genetic testing affect my insurance?
GINA protects against genetic discrimination in US health insurance and employment. It does not cover life, disability or long-term-care insurance, so ask about those before testing. Also confirm coverage for the test itself with your insurer and provider.
Educational resource. CardioGenes shares general information and connects people with independent cardiologists. It is not medical advice, diagnosis or treatment. Talk with a licensed professional about your health.