Feline Hyperthyroidism

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Did You Know? 

  • It is the most common endocrine disorder in cats over 7 years old.
  • It occurs in about 10% of cats over 10 years of age. 
  • It is caused by an overactive thyroid gland that secretes excess thyroid hormone.
Excess thyroid hormone causes and overactive metabolism that stresses the heart, digestive tract, and many other organ systems. 

Untreated Hyperthyroidism Effects 

  • Marked weight loss, usually in spite of a good appetite.
  • Increased thirst and urination.
  • Gastrointestinal upset, like vomiting and diarrhea.
  • Damage to organs, especially the heart and kidneys.

Diagnosis

Generally, simple blood tests are all that is needed. Some cats that also have other health problems will require additional tests before treatment can be started.  Annual screening can detect this disease before serious problems occur. 

Treatment

There are four basic treatments: daily medication, special food, radioiodine, and surgery. Your veterinarian will discuss the best option for your cat. 
​Advantages and Disadvantages of Each Treatment. 

Did you know? 

Dr. Dennis co-authored the most current  Guidelines for Feline Hyperthyroidism. 
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Blindness in a cat due to high blood pressure from hyperthyroid disease. Photo by Dr. Ward.
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