Hyperthyroidism in Cats

Hyperthyroidism in Cats | Clinical Signs, Causes & Treatment Options UK

Learn about hyperthyroidism in cats, including clinical signs or symptoms, diagnosis and treatment options. Expert guidance on managing overactive thyroid disease in cats.

What is hyperthyroidism in cats?

Hyperthyroidism is one of the most common conditions affecting older cats. It develops when the thyroid glands, located in the neck, become overactive and produce excessive thyroid hormone. This hormone controls the body’s metabolism, so when levels are too high, the body effectively speeds up.

You may have noticed a gradual weight loss in your cat despite a good appetite. Cats can become more restless, vocal, or unsettled, and it is common to see increased thirst, more frequent urination, vomiting, or a decline in coat condition. In some cases, the changes are subtle and develop slowly over time.

In most cats, hyperthyroidism is caused by a benign enlargement of the thyroid tissue. Hyperthyroidism can have serious effects on the heart, blood pressure, and other organs if left untreated.

How is hyperthyroidism diagnosed?

Diagnosis is usually straightforward and involves a blood test measuring thyroid hormone levels. Your vet may also recommend additional tests to assess overall health, particularly kidney function, as this can influence treatment decisions.

Why treatment is important

Without treatment, hyperthyroidism can lead to progressive weight loss, heart disease, high blood pressure, and organ damage. Fortunately, with appropriate treatment, most cats respond very well and can return to a good quality of life.

Helpful Links

International Cat Care – Hyperthyroidism in cats