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<p>Palpitation can be attributed to one of five main causes:<br/>
# Extra-cardiac stimulation of the <a href="page.php?w=sympathetic_nervous_system">sympathetic nervous system</a> (inappropriate stimulation of the sympathetic and parasympathetic, particularly the <a href="page.php?w=vagus_nerve">vagus nerve</a>, (which <a href="page.php?w=Innervation">innervates</a> the heart), can be caused by anxiety and stress due to acute or chronic elevations in <a href="page.php?w=glucocorticoids">glucocorticoids</a> and <a href="page.php?w=catecholamines">catecholamines</a>.</p><p>
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