Symptoms in most cats are similar to those that occur in humans with hyperthyroid conditions. In general, there is an elevated metabolic rate leading to an increased appetite that may or may not be accompanied by increased water consumption. Digestive disorders, weight loss and hyperactivity are also key symptoms of hyperthyroidism. Radioactive iodine provides a simple and safe treatment for hyperthyroidism. The radioisotope naturally concentrates in the thyroid gland and selectively irradiates and destroys the overactive thyroid tissue.
Side effects are minimal.
A similar radiation therapy procedure using I-131 is also the preferred treatment for humans with this condition.