author(s)
DS Khare, DK Gupta, PC Shukla, NS Meena and Ravi Khare

abstract
The overall prevalence varies geographically from 2.4% to 11.4%, with more specifically a prevalence of 8.7% to 11.4% in older cats. Only about 5% of hyperthyroid cats are younger than ten years at the time of diagnosis ^[10]. In 99% of cases, the cause is benign nodular adenoma (s). These nodules autonomously secrete the thyroid hormones T₄ (thyroxine) and T₃ (triiodothyronine) in excess, resulting in multisystemic disease ^[12]. Thyroid hormones normally regulate many of the body’s metabolic processes. High thyroid hormone concentrations also interact with and stimulate the central nervous system, which commonly leads to increased activity or restlessness. There are several diagnostic modalities available where scintigraphy stands out as the most important modality for diagnosis of hyperthyroidism. Some specific thyroid function tests like Total T₄ concentration, Free T₄ concentration and T₃ suppression test also help in the diagnosis of hyperthyroidism in cats and routinely used test for this purpose. The numbers of possible management options have expanded in recent years that include oral anti-thyroid medication, Iodine-restricted food, radioiodine, surgical thyroidectomy and transdermal anti-thyroid medication ^[1].