There is also a therapeutic hyperthyroidism management diet available by prescription. Your veterinarian will advise you on whether that would be an option for your cat.
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If your cat has exhibited any of the signs mentioned above, visit your veterinarian so a proper diagnosis can be made. If you have noticed behavioral changes such as nervousness, irritability or aggression, don’t assume it’s behavioral without having your veterinarian rule out underlying medical causes.
Here are some links to more detailed article on hyperthyroidism in cats: