Feline Hyperthyroidism is a disorder that occurs when the feline thyroid gland produces an excess of thyroid hormone. An excess of thyroid hormone affects all of the cat’s organ systems. This often occurs in cats in their middle age or senior years, and is common across both sexes and all breeds. Some symptoms of feline hyperthyroidism include weight loss, changes in behavior, excessive or decreased appetite, increased water intake, hyperactivity or lethargy, and excessive shedding.

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