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What is hyperthyroidism? Hyperthyroidism is a very common disease afflicting primarily middle-aged and older cats. Also called thyrotoxicosis, hyperthyroidism is caused by an increase in production of thyroid hormones (known as T3 and T4) from enlarged thyroid glands in the cat's neck. In most cases, enlargement of thyroid glands is caused by a tumor called an adenoma, which is non-cancerous.
Hyperthyroidism means that the thyroid gland makes and releases too much thyroid hormone, causing symptoms such as weight loss, higher blood pressure and nervousness. A mild form of the condition is called subclinical hyperthyroidism. In this study, researchers looked at about 6,200 people in Denmark who were diagnosed with subclinical hyperthyroidism between 2000 and 2009 and found that they had a significantly increased risk of dying from cardiovascular disease and other causes.