Sometimes I get this feeling of tiredness and shortness of breath that usually lasts for a few days. I've been experiencing it on and off for the past couple of years, but there are no other symptoms accompanying it. Im a 34-year-old male, and Ive had my ECG, echo, and lipid profile checked, and everything came back normal. Could there still be a chance of a heart issue, and is there any other test I should consider?

There may still be a possibility of underlying cardiac issues. To further investigate, you can consider undergoing a stress test (TMT - Treadmill Test) to assess your heart's response to physical activity and detect any abnormalities that may not be present at rest. Additionally, a Holter monitor can be used to monitor your heart's activity over a 24-48 hour period to capture any irregularities that may not show up during a standard ECG. These tests can provide more insights into your cardiac health beyond the initial screening tests you have already done.