Harvard Heart Letter

How thyroid hormone affects the heart

The thyroid gland secretes hormones that regulate metabolism and energy levels. When it produces too little thyroid hormone, the heart can lose pumping strength, and cholesterol and blood pressure rise. Too much thyroid hormone can cause the heart to race and raises the risk of developing heart failure. Anyone with heart disease who has the symptoms of thyroid trouble should see their cardiologist or primary care doctor for simple blood test.
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