Companion Animals

Cat Hyperthyroidism Surgery: When Thyroidectomy Is Appropriate

Surgical thyroidectomy can cure feline hyperthyroidism. Understanding when surgery is appropriate compared to medical management or radioiodine guides better welfare decisions.

Key Facts

Thyroidectomy achieves cure in 90% of unilateral cases and 70% of bilateral cases
Hypoparathyroidism causing hypocalcaemia is the main surgical complication
Bilateral thyroidectomy requires careful parathyroid preservation to prevent hypocalcaemia
Surgery requires general anaesthesia and carries standard surgical risks in older cats
Radioiodine is preferred where available due to lower complication rates and outpatient treatment
Surgical expertise significantly affects outcomes - referral to an experienced surgeon is important

Welfare Considerations

Thyroidectomy offers curative potential for hyperthyroid cats unable to access radioiodine or manage long-term medication. The welfare case for cure over ongoing medical management is strong when surgery is performed by a skilled surgeon with appropriate monitoring. Hypocalcaemia post-surgery is a life-threatening complication requiring prompt recognition and calcium supplementation. Owner preparedness for postoperative monitoring is essential for good welfare outcomes.

What You Can Do

Discuss all hyperthyroidism treatment options including surgery with your vet
If surgery is chosen, seek referral to a specialist in veterinary soft tissue surgery
Prepare for postoperative monitoring by learning to recognise signs of hypocalcaemia