Could having bradycardia while sitting down mean its something to worry about?

Depends on Symptoms: The answer to this depends largely symptoms. In general for a patient with bradycardia, if there is no lightheadedness, dizziness, passing out, or difficulty with exertion there is no major concern. Two caveats: 1) it is important to know the underlying rhythm, something that can easily be checked with an electrocardiogram. 2) the bradycardia could point to another condition like hypothyroidism.