Hyperthyroidism in Cats


Why Should I Bring my Cat to Willows for Hyperthyroidism?

Willows offers Radioactive Iodine (RAI) treatment for hyperthyroidism in cats. This is currently considered the best treatment for this disorder.

What is Feline Hyperthyroidism?

Hyperthyroidism is an endocrine (glandular) disorder that is common in older cats. This is caused by the excessive production of thyroid hormones (i.e. an overactive thyroid gland disorder).

What is the Most Common cause of Hyperthyroidism in Cats?

Hyperthyroidism is usually caused by a benign tumour causing excessive thyroid hormone production.


What are the Signs of Hyperthyroidism?

The most common signs associated with hyperthyroidism are: weight loss, an increased appetite, diarrhoea, increased thirst and restlessness.


How is Hyperthyroidism Diagnosed?

Hyperthyroidism can usually be diagnosed by a simple blood test.


What are Treatments are Available for Hyperthyroidism?

There are four different types of treatment for hyperthyroidism including:

  • Medication
  • Diet
  • Surgery
  • Radioactive iodine (RAI).

Medications and diet do not cure this condition, and so lifelong administration/feeding is needed. Surgery can cure hyperthyroidism but this can be associated with complications. RAI is considered the best treatment for hyperthyroidism as it does not require an anaesthetic, a single treatment can cure 95% of cats and it is also associated with few complications.

To save this page as a PDF, click the button and make sure “Save as PDF” is selected.

Radioactive Iodine

Find out more

To assist owners in understanding more about Hyperthyroidism in cats we have put together some information sheets to talk you through Radioactive Iodine Therapy.