Companion Animals

Hyperthyroidism in Cats and Welfare

Hyperthyroidism is the most common hormonal disease in older cats and significantly affects their quality of life.

Key Facts

Hyperthyroidism affects approximately 10% of cats over 10 years old
The thyroid gland overproduces thyroxine causing metabolic acceleration
Affected cats often lose weight despite increased appetite
Heart disease, hypertension, and kidney disease are common complications
Treatment options include medication, radioactive iodine, surgery, and diet

Welfare Considerations

Untreated hyperthyroidism causes significant suffering. Cats experience chronic hunger, agitation, intolerance to heat, rapid heart rate, and progressive weight loss. Hypertension causes eye and brain damage. The condition is highly treatable, and early diagnosis greatly improves quality of life. Radioactive iodine treatment offers a permanent cure with minimal side effects and is considered the gold standard.

What You Can Do

Schedule annual veterinary health checks for cats over 8 years old
Learn to recognise weight loss, increased appetite, and restlessness in older cats
Seek prompt veterinary attention if hyperthyroidism is suspected
Consider radioactive iodine treatment as a permanent cure
Avoid environmental factors linked to thyroid disruption including flame retardants