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Best Answer: Yes there is a link between having an underactive thyroid and having high cholesterol. In someone with high cholesterol, thyroid function is usually one of the first things that gets investigated.
Hyperthyroidism (overactive thyroid) Definition. Hyperthyroidism (overactive thyroid) is a condition in which your thyroid gland produces too much of the hormone thyroxine. Hyperthyroidism can accelerate your body's metabolism significantly, causing sudden weight loss, a rapid or irregular heartbeat, sweating, and nervousness or irritability.