Home > Over Caressa > Folders > Information paper – Thyroid gland in cats that works too fast
The thyroid gland consists of 2 lobes, which lie on either side of the windpipe in the throat area. The main task of the thyroid is to produce thyroid hormone, also called T4. This hormone regulates the speed of metabolism and thus the rate of consumption of nutrients and energy.
In cats we usually see an overproduction of thyroid hormone, this condition is called hyperthyroidism. The thyroid gland then works too fast and causes a faster metabolism. Hyperthyroidism occurs mainly in older cats, 8 years and older. It is the most common metabolic disorder in cats.
Overproduction of thyroid hormone is caused by a benign tumour or hyperplasia in 98% of cases, only in 2% by a malignant tumour.Â
The underproduction of the hormone is very rare in cats, but we see it more often in dogs. In about 70% of cases both lobes of the thyroid gland are hyperactive.
In some cases, other symptoms occur, which are more consistent with apathetic hyperthyroidism. In these cases the appetite is reduced, the cat becomes sluggish and shows muscle weakness.
Because the metabolism increases in speed, all organs in the body have to work faster. As a result, ‘wear and tear’ complaints may arise in other organs.
By means of a blood test the total amount of thyroid hormone (total T4) can be determined. We recommend also determining the kidney and liver values. If there are indications of reduced kidney function, we also check the urine.
Sometimes an enlarged thyroid gland can be felt. A blood test is then necessary to confirm the diagnosis, as there are also thyroid tumours that do not produce extra hormones.
There are 3 different therapy options:
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The choice depends on a number of factors, such as age, whether a cat takes medication easily, the general physical condition of the cat, the kidney function and the cost of the treatments. We will go through the options with you to choose the best possible therapy.
If you have any further questions regarding this information letter, please do not hesitate to contact us.