Diseases, Conditions, Syndromes

A healthy thyroid can be key to a healthy heart

Make a list of the ABCs of heart health, from arrhythmia to Zumba classes, and you might not think to include a T—for thyroid. But the small gland that produces crucial hormones can have a big effect on the cardiovascular ...

Diseases, Conditions, Syndromes

Hyperthyroidism vs. hypothyroidism—what's the difference?

In our daily life, we may sometimes feel run down, stressed or have unexpected weight fluctuations and think it is nothing out of the ordinary. Yet for some people, these symptoms could be a sign of an underactive or overactive ...

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Hyperthyroidism is the term for overactive tissue within the thyroid gland causing an overproduction of thyroid hormones (thyroxine or "T4" and/or triiodothyronine or "T3"). Hyperthyroidism is thus a cause of thyrotoxicosis, the clinical condition of increased thyroid hormones in the blood. Hyperthyroidism and thyrotoxicosis are not synonymous. For instance, thyrotoxicosis could instead be caused by ingestion of exogenous thyroid hormone or inflammation of the thyroid gland, causing it to release its stores of thyroid hormones. Its opposite is hypothyroidism which is an underproduction of the hormone.

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