Neuroscience

A new type of nerve cell found in the brain

Scientists at Karolinska Institutet in Sweden, in collaboration with colleagues in Germany and the Netherlands, have identified a previously unknown group of nerve cells in the brain. The nerve cells regulate 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 ...

Diseases, Conditions, Syndromes

Thyroid problems linked to irregular heart rhythm

People with an overactive thyroid gland (hyperthyroidism) carry a greater risk of developing irregular heart rhythm (known as atrial fibrillation) than those with normal thyroid function, finds a study published on BMJ today.

Diseases, Conditions, Syndromes

The Medical Minute: Atrial Fibrillation -- What is It?

Atrial fibrillation (AF) is the most common heart rhythm disturbance in the United States and affects 2 to 4 million Americans. It is usually a disease of aging, however it can affect people of all ages -- 1 percent of people ...

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Hyperthyroidism is the term for overactive tissue within the thyroid gland that causes 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. The opposite of hyperthyroidism is hypothyroidism, which is an underproduction of the hormone.

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