Companion Animal Welfare

Cat Hyperthyroidism Management and Welfare

Feline hyperthyroidism is one of the most common diseases in older cats, with significant welfare implications if undertreated or managed poorly.

Key Facts

Hyperthyroidism affects around 10% of cats over 10 years of age
Symptoms include weight loss, increased appetite, vomiting, hyperactivity and poor coat
Untreated hyperthyroidism causes cardiac damage, hypertension and kidney failure
Treatment options include daily medication, radioactive iodine, surgery or dietary restriction
Radioactive iodine is considered curative with a single treatment in most cases

Welfare Considerations

Hyperthyroid cats often appear energetic despite significant internal distress. The disease causes muscle wasting, gastrointestinal upset and cardiovascular strain. Owners must monitor for signs of concurrent kidney disease revealed after treatment. Medication compliance is challenging — cats resist daily tablets, making alternative treatments preferable for long-term welfare. Regular blood monitoring is essential throughout management.

What You Can Do

Have older cats (8+) screened annually for hyperthyroidism
Discuss radioactive iodine treatment with your vet as a curative option
Monitor weight, coat condition and behaviour changes in senior cats
Ensure post-treatment kidney function checks are scheduled