Harvard Heart Letter

Hypothyroidism and your heart

Treating a borderline low thyroid hormone level may be unnecessary perhaps even undesirable in older people. Your thyroid, a butterfly-shaped gland at the base of your throat, releases hormones that affect your entire body, including your heart. An underactive thyroid, or hypothyroidism, can trigger a range of symptoms, including fatigue, feeling cold, and unexplained weight gain. If left untreated, hypothyroidism can slow the heart rate and make the arteries less…

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