Feline hyperthyroidism was first reported in 1979 in North America. The prevalence of the disease is increasing, especially in older cats, and is now considered the most common feline endocrinopathy.

Etiological factors such as exposure to persistent organic pollutants, and especially brominated flame retardants, have been suggested to be a reason for the increased prevalence.

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Are persistent organic pollutants important in the etiology of feline hyperthyroidism? A review.