Thyroid hormones play a major role in regulating an animal's metabolism.  Hyperthyroidism is a result of the over production of hormone by the thyroid gland.  In cats, the most common cause is a non-contagious growth that overproduces thyroid hormone, which increases the cat's metabolism.  

Hyperthyroidism is most commonly seen in cats over the age of 13 years, but can be seen earlier.  The most common symptoms of hyperthyroidism in cats are:
    Weight loss - **Despite a good appetite
    Frequent bowel movements - often soft stool or diarrhea
    Increased thirst and urination
    Restlessness
    Vocalization
    Intermittent Vomiting

Diagnosis of Hyperthyroidism is usually based on history, symptoms and bloodwork.  Most cats have enlarged thyroid glands that can be palpated on the neck.  Bloodwork helps to rule out or detect any concurrent diseases, such as renal (kidney) failure or diabetes.  If the thyroid hormone is elevated on a screening test, a more detailed test can be performed to confirm the diagnosis.

There are various methods of treatment for cats with Hyperthyroidism.  Daily dosing with an anti-thyroid medication controls the levels of circulating hormones - this is a lifelong treatment.  Alternatively, Radioactive Iodine Treatment can provide a permanent cure, but is much more costly.  Prognosis depends on multiple factors such as concurrent diseases or drug reactions.  Occasionally, secondary complications such as kidney or heart disease may occur.  The animal's health at the time of diagnosis and response to treatment are key.

A new treatment has just been introduced for the treatment of Hyperthyroidism in cats.  A dietary formula which is low in iodine has been formulated for hyperthyroid cats.  It must be the sole source of the cat's diet - no tuna or other treats - for the duration of the pet's lifetime.  

If you are concerned your cat may be exhibiting any of the signs of thyroid disease, please call our office.  Together, we can help increase the number of quality years we get to spend with our feline friends!