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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 can affect many parts of the body, and treatment can often lead to normalization of these conditions. These are some ways that an underactive thyroid can affect the body: 1  High cholesterol and heart disease: Hypothyroidism slows your body's metabolism and can cause a buildup of bad cholesterol.2  It can also slow the heart and lead to an enlarged heart or heart failure.ypothyroidism can affect many parts of the body, and treatment can often lead to normalization of these conditions. These are some ways that an underactive thyroid can affect the body: 1  High cholesterol and heart disease: Hypothyroidism slows your body's metabolism and can cause a buildup of bad cholesterol.