How is Enlarged Heart (Cardiomegaly) Diagnosed?

Happy Kumari   by Happy Kumari, M.S., Biotechnology    Last updated on April 19, 2021,

diagnosis of enlarged heart

What are the warning signs that indicate my heart may be enlarged and require a diagnosis?

There are a variety of diagnostic techniques used by doctors to confirm a diagnosis of an enlarged heart. However, you can note certain early signs that indicate that it may possibly be due to enlarged heart or related complication as a result of due enlarged heart or that may eventually cause your heart to enlarge.

It is this time that you should contact your doctor for a confirmed diagnosis of the heart condition.

Some of these warning signs of the enlarged heart (cardiomegaly) are:

  • Signs of enlarged heart are generally similar to that of a congestive heart failure
  • Shortness of breath
  • Swelling in legs
  • Weight gain
  • Heart palpitations
  • Fatigue
  • Breathing problems

Diagnosing enlarged heart: How do doctors identify that your heart is enlarged?

Doctors use one or more of the following tests to confirm the diagnosis:

Chest X-ray

An x-ray of the chest shows the condition of your lungs and heart. If your heart appears enlarged, your doctor may ask for more tests to determine the actual cause of the enlarged heart. Note that enlarged heart is not a disease but a symptom due to an underlying medical condition.

Electrocardiogram (ECG)

An ECG is used to record electrical activities within the heart through the use of electrodes that are applied to the skin. The test is used to identify any issues with your heart’s rhythm or find damage caused by a heart attack.


An echocardiogram uses sound waves to create images that allow your doctors to see if the heart is enlarged.

Stress test

Your doctor will ask you to walk on a treadmill or ride a stationary bike and monitor your blood pressure, heart rhythm, and breathing during exercise (increased physical activity). This allows doctors to see how well your heart functions under stress.

Cardiac computerized tomography (CT Scan) or magnetic resonance imaging (MRI)

CT scans and MIR are used to take images of your heart. You are asked to lie still on a table and are moved through a large ring. The images produced in the procedure enables your doctor to determine whether your heart is enlarged or normal.

Cardiac catheterization

In this procedure, a catheter is inserted in the groin or from hand and threaded through the blood vessels into your heart. The procedure is generally done local anesthesia. A person is awake and can see the procedure happening.

The test looks for blockages in the coronary arteries. Your heart's size and pumping function can also be checked.


This can be done during cardiac catheterization. Your doctor will take a sample from the heart and send it for laboratory analysis.

Blood Tests

Your doctor may order some blood tests to check the levels of certain substances in your blood that may indicate a heart problem. Blood tests also help your doctor exclude other conditions that might be causing similar symptoms, such as the following:

After the diagnosis of enlarged heart and the underlying conditions is done, treatment of cardiomegaly begins which aim at treating the underlying conditions behind the disease and reducing unnecessary stresses on heart muscles. Read about treatment of enlarged heart (cardiomegaly).

Happy Kumari

Happy Kumari is a biotechnologist with Masters degree in Biotechnology. She has pursued her Bachelors and Masters degrees from Amity University, Noida. She aspires to contribute in the field of healthcare and research. Happy has worked at Effectual Knowledge Services as a Patent Associate.


Currently she is associated with Maxinov Solutions Private LTD as Research Analyst and a medical content writer at Diseasefix.


Happy's area of interest includes research in the field of Cancer Biology.

Read More Articles by this Author