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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 is a condition in which there is an excessive amount of thyroid hormones. Thyroid hormones regulate the metabolism of the cells. Normally, the rate of thyroid hormone production is controlled by the brain from the pituitary gland, which is in turn regulated by the hypthalamus. There are many possible causes of hyperthyroidism. Graves' disease, the most common cause of hyperthyroidism, can be associated with eye disease (Graves' opthalmopathy). Common symptoms of hyperthyroidism include restlessness, agitation, anxiety, tremors, weight loss despite an increased appetite, sweating, rapid heart rate, intolerance to heat, and.