Hypothyroidism and high cholesterol: Any connection?

Is there any connection between hypothyroidism and high cholesterol?

- Sue / Illinois

Mayo Clinic cardiologist Gerald Gau, M.D., and colleagues answer select questions from readers.

Answer

Yes. Decreased metabolism associated with underactive thyroid (hypothyroidism) causes high cholesterol. Treatment of hypothyroidism with thyroid hormone may improve cholesterol levels. If you have high cholesterol — especially if you have no previous history of high cholesterol — your doctor may recommend checking your thyroid hormone levels to see if an underactive thyroid is causing or contributing to the problem.