My cat has hyperthyroidism symptoms & won't eat. When to see vet?

Question

My pet's regular vet believes she may have early signs of hyperthyroidism. For the last two meals she's managed about half her normal amount. This evening she's shown no interest in her regular food or a bland pouch of wet food I went out and bought which she normally raves about. Has been noticeably quiet all day. How much longer should I leave it before considering taking her in for a follow up appointment? Seems interested in everything otherwise, just not food. Pet's info: Cat | Domestic Shorthair | Female | spayed | 10 years and 4 months old | 13.9 lbs

Lauren Jones VMD · Accepted Answer

I'm sorry to hear that Cleo isn't eating as well as she normal does. Hyperthyroidism typically causes weight loss despite an increase in appetite, although rare cats may experience a decreased appetite. The change in Cleo's appetite alone may or may not be associated with hyperthyroidism. Other causes of this sudden lack of interest in food and lethargy could be related to a gastrointestinal virus, kidney disease, parasites, liver disease, among many other conditions. If she still isn't eating normally in the next day or two, Cleo should go to her vet for evaluation and likely blood testing. However, if she becomes experiences extreme lethargy, experiences profuse vomiting or diarrhea, or will not drink water, Cleo should go to the vet immediately. I hope this helps and that Cleo feels better soon!

My cat has hyperthyroidism symptoms & won't eat. When to see vet?

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