Tiredness that won't go away: could it be the heart?

What many people think

It is usually blamed on stress or anemia.

Why it may be related to the heart

When the heart does not pump at full strength or beats out of rhythm, the body gets less energy and tiredness appears.

When to see a cardiologist

If tiredness comes with shortness of breath, swollen legs or palpitations.

Tests usually ordered

  • Electrocardiogram (ECG)
  • Echocardiogram
  • Blood tests

Frequently asked questions

Is all tiredness caused by the heart?

No. It has many causes. A visit helps sort out the symptoms and decide what to test.

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Reviewed by Dr. Rebeca Granada, cardiologist · RP 17.697 · Updated 13/10/2026

This does not replace a medical visit. If these symptoms sound familiar, see a cardiologist.