When your body has too much thyroid hormone, it makes your heart beat faster and makes you sweat more—even when you're not exercising or stressed out.
Evidence from Studies
Supporting (2)
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Thyroid hormone regulation of beta-adrenergic receptor number.
Too much thyroid hormone makes the heart have more sensors that respond to adrenaline, so the heart beats faster even when you're just sitting still. This explains why people with overactive thyroids often feel their heart racing without any reason.
Effects of thyroid hormone on beta-adrenergic responsiveness of aging cardiovascular systems.
The study found that too much thyroid hormone makes the heart more sensitive to adrenaline-like signals, which can make the heart beat faster and cause sweating—even without exercise or stress. This matches what the claim says.
Contradicting (1)
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Effects of thyroid hormone on cardiac beta-adrenergic responsiveness in conscious baboons.
The study found that too much thyroid hormone makes the heart have more beta-receptors, which makes it beat faster and stronger — but each receptor doesn’t become more sensitive. The claim says the receptors get more responsive, but the study shows they don’t — just more of them are there.
Gold Standard Evidence Needed
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