Hyperthyroidism is the most common hormonal disease in older cats. Left untreated it causes progressive weight loss, cardiac disease, and distress. Several effective treatments exist.
Hyperthyroid cats experience a gradual escalation of suffering if untreated. The condition causes systemic effects including hypertension, cardiac enlargement, and renal compromise. Paradoxically, many affected cats appear normal or even over-energetic in early stages, making owner recognition difficult. Untreated hyperthyroidism progresses to severe distress. Treatment options including radioactive iodine, medication, surgery, and iodine-restricted diet are all effective, allowing cats managed appropriately to return to normal quality of life for several more comfortable years.