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Many cats with hyperthyroidism lose weight despite being ravenous. Often these cats eat so quickly that they vomit. Many also have diarrhea. They are hyperactive and irritable, expressing a meanness that hadn't been seen before. They look unkempt and have poor coats and thickened nails. Their hearts beat so strongly and rapidly that you can feel a "gallop" rhythm with your hand over the chest.
Tests that suggest hyperthyroidism in cats