Companion Animals

Feline Hyperthyroidism: Welfare and Treatment

Hyperthyroidism is the most common endocrine disease in older cats and causes significant suffering if unrecognised and untreated.

Key Facts

Hyperthyroidism affects an estimated 10% of cats over 10 years of age
The condition causes weight loss, increased appetite, vomiting, and hyperactivity
Untreated hyperthyroidism leads to heart disease and hypertension
Radioactive iodine treatment offers a curative option with excellent welfare outcomes
Long-term medical management with methimazole is effective if compliance is maintained

Welfare Considerations

Cats with untreated hyperthyroidism experience chronic discomfort from elevated metabolism, heart pounding, and hypertension that can cause blindness. Regular veterinary checks for older cats allow early detection. Treatment significantly improves quality of life and can be highly effective. Owner education about clinical signs is key to reducing the welfare burden of this condition.

What You Can Do

Schedule annual veterinary checks for cats over 7 years including thyroid assessment
Learn the signs of hyperthyroidism including weight loss despite good appetite
Discuss treatment options with your vet including radioactive iodine if available
Maintain regular monitoring if your cat is on medical management
Join support groups for owners of cats with hyperthyroidism for practical advice