Thyroid glands are present on either side of the windpipe in the neck. They regulate the body’s metabolism by secreting thyroid hormones. The excessive production of the thyroid hormone causes hyperthyroidism which increases the metabolic rate of the body while underproduction of thyroid hormone causes hypothyroidism or slowing down of metabolism. Hyperthyroidism is more prevalent in cats as compared to hypothyroidism. Middle-aged and older cats are predisposed to hyperthyroidism. The symptoms of hyperthyroidism include increased appetite, weight loss, vomiting, increased thirst, frequent urination, and certain behavioral changes. Treatment of hyperthyroidism includes several therapies. Your vet will discuss the most appropriate and safest therapy for your cat.