Hyperthyroidism is a condition characterized by increased levels of thyroid hormones. This condition can affect various parts of the body including the heart and gastrointestinal tract. Middle-aged to older cats are usually affected. Here is everything you need to know regarding this condition.


Feline Hyperthyroidism causes increased thyroid hormone circulation. Cancerous cells affecting the gland are usually the reason. Cats who are older usually experience this condition.


As mentioned earlier, various systems in the body can be affected. Therefore, signs vary widely. Some of these signs include weight loss, increased thirst and urination, increased appetite, and increased activity levels.

The disease also can affect the gastrointestinal tract. This leads to diarrhea and vomiting. If this condition affects the heart, arrhythmias, increased heart rate, and heart failure can occur.


Feline hyperthyroidism shares some of the same signs as various other conditions. Kidney disease, liver disease, and diabetes are three of the most common. The vet will need to perform a thyroid test and blood panel in order to make a diagnosis.


Your cat can receive three different methods of treatment for this disease. A daily pill can be given to your cat for treatment. Removal of the thyroid gland is also an option. However, thyroid tissue may be left in other areas of the body and may not treat the condition successfully.

Irradiated iodine is the final method to treat this disease. The iodine course is the most successful since it removes all the thyroid tissue in the body. However, it is the most expensive.

Author: Darrin Swain