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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.
Hypothyroidism. Too little thyroid hormone from an underactive thyroid gland is called hypothyroidism. In hypothyroidism, the body's metabolism is slowed. Several causes for this condition exist, most of which affect the thyroid gland directly, impairing its ability to make enough hormone.