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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.
What is overactive thyroid (hyperthyroidism)? An overactive thyroid (also called hyperthyroidism or thyrotoxicosis) is when the thyroid gland produces more thyroid hormones than normal. The thyroid gland may become enlarged, or contain nodules (lumps) of overactive tissue. This excess thyroid has the effect of speeding up metabolism throughout the body.