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Hyperthyroidism in Old Cats

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Hyperthyroidism in Old Cats is a common hormone disorder, but is rarely seen in cats under 8 years old. The average age for a diagnosis is 13 years. In fact, 95% of cats with hyperthyroid disease are 10 years old or older. Hyperthyroidism is caused by a benign tumor of the thyroid gland called an Adenoma.

Thyroid hormone production is increased, but too much can cause hyperactivity in all body functions. The changes are subtle and often people put weight loss and poor coat down to old age.

Hyperthyroidism in old cats can lead to high blood pressure and heart disease.

Symptoms of Hyperthyroidism in Old Cats

Symptoms you should look out for are vomiting, diarrhoea, poor coat condition, restless, increased thirst, fast heart rate, increased hunger, and weight loss. These symptoms will worsen if you do not get them treated.

Most cases of hyperthyroidism are caught in the early stage because the owners notice the changes in their cat and seek the help of their vet straight away.


It is important to decrease high blood pressure so that the other issues that accompany this will also subside. There are three types of treatment available for high blood pressure:

  • Food. There is a specific thyroid diet which has only just enough iodine for normal thyroid function.
  • Your vet can recommend and prescribe a suitable Medication.
  • Surgery is available, but you should understand the risks to your pet.

Like most illnesses, early identification and treatment of Hyperthyroidism in Old Cats will give your them a better chance of survival.

In the worst case scenario, yo may have to make the difficult decision of opting for pet euthanasia. Of course, this is an incredibly challenging decision to make. However, it is often the most humane and dignified end of life for your cat. Cloud 9 vets are experience in this procedure and can help you prepare for this most challenging time. Please contact us today for advice and assistance.

Cloud 9 Vets
Cloud 9 Vets
To ensure accuracy, a professional vet has reviewed and verified the information presented in this article. It is important to note that when it comes to making decisions about euthanasia for your pet, there are no easy answers. It is always recommended to seek advice from your own veterinarian before making any decisions.