Companion Animals

Feline Hyperthyroidism and Welfare

Hyperthyroidism is the most common hormonal disorder in older cats, causing significant suffering if untreated but highly manageable with appropriate care.

Key Facts

Approximately 10% of cats over 10 years develop hyperthyroidism
The condition causes weight loss despite increased appetite, hyperactivity, and hypertension
If untreated, hyperthyroid cats can develop heart disease, blindness from hypertension, and kidney failure
Treatment options include medication, radioactive iodine, surgery, and dietary management

Welfare Considerations

Feline hyperthyroidism profoundly affects quality of life through systemic effects on multiple organ systems. The condition is often insidious in onset and many cats suffer for months before diagnosis. Regular veterinary screening of older cats enables early detection and treatment. With appropriate management, most hyperthyroid cats can live comfortable lives for many more years.

What You Can Do

Have cats over 10 years checked annually for thyroid disease
Learn the signs of hyperthyroidism including weight loss despite good appetite
Discuss treatment options with your vet to find the best approach for your cat
Monitor treated cats regularly as medication doses may need adjustment