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Cats have a thyroid gland that regulates their metabolism, not unlike humans. If the gland develops a tumor (almost all are non-cancerous), hyperthyroidism can occur. Symptoms include changes in behavior, changes in eating habits, weight loss, fever, rapid heartbeat, changes in litter box habits, shedding and diarrhea. Untreated, this condition can be fatal. Our BluePearl veterinary specialists can diagnose this condition and treat your cat. Radioiodine I-131 treatment can cure hyperthyroidism in most cats with one injection. Your cat stays with us for several days (governed by state law). We pamper your cat with music, attention and food. Normal thyroid function typically returns within a month.