Hyperthyroidism is a condition in which the thyroid increases in size, usually due to the growth of a benign tumor. This size increase results in the presence of higher T4 thyroid hormone levels in the body. The most common endocrine disorder in cats, hyperthyroidism is a serious condition and can be fatal if left untreated. Fortunately, the problem is treatable with either surgery or medication and can usually be diagnosed with a simple blood test.
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Palpable Thyroid
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In some instances of hyperthyroidism, the cat's thyroid gland becomes so enlarged it can be felt.
Stomach Upset
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Frequent instances of vomiting and diarrhea are common signs of hyperthyroidism in cats.
Weight Loss
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It is common for cats with hyperthyroidism to lose weight, even if there is no decrease in the animal's food intake. Some cats with hyperthyroidism develop ravenous appetites but still lose weight.
Thirst
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Some cats with hyperthyroidism will increase their water intake.
Age
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Cats are most likely to be diagnosed with hyperthyroidism when they are between 10 and 13 years of age.
Coat
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Cats with hyperthyroidism sometimes experience a change in the health of their coat. The coat may become dull and disheveled.
Internal Problems
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High blood pressure and heart disease often accompany untreated hyperthyroidism.
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