What are the symptoms of thyroid problems in cats?

The thyroid gland puts out a hormone called thyroxine, which helps the cat's body digest food and burn through the energy that food produces. When the thyroid doesn't put out enough thyroxine, this is called hypothyroidism. This is rare in cats. But hyperthyroidism--where the thyroid puts out too much thyroxine--is far more common, especially in older cats.

Appetite Change

In hypothyroidism, the cat will lose his or her appetite. But in hyperthyroidism, the cat will seem constantly hungry and will be prone to vomiting up food that was eaten too quickly.

Weight Change

In hypothyroidism, the cat may gain weight, even though the appetite decreases. But in hyperthyroidism, the cat will quickly lose weight.

Fur Change

In both hypothyroidism and hyperthyroidism, the cat's fur will thin and may feel harsh. Hyperthyroid cats may also develop bald patches.

Bowel Movement Changes

In hypothyroidism, the cat will become constipated and have smaller bowel movements. But in hyperthyroidsim, the cat usually gets foul-smelling diarrhoea.

Activity Changes

Hypothyroid cats become more sluggish, but hyperthyroid cats often become more active in a search for more food, sometimes pacing about the home all night.

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About the Author

Rena Sherwood is a writer and Peter Gabriel fan who has lived in America and England. She has studied animals most of her life through direct observation and maintaining a personal library about pets. She has earned an associate degree in liberal arts from Delaware County Community College and a bachelor's degree in English from Millersville University.