The term "hyperthyroid" refers to a medical condition where the thyroid gland becomes overactive and produces too much thyroid hormone. Full definition
For example, in the case of hyperthyroid cats with high blood pressure, weight loss (in spite of a voracious appetite) and hyperactivity may be the major clinical signs. (icatcare.org)
His interests are in diagnostic imaging, including radiology, ultrasound and CT, I - 131 treatment of hyperthyroid cats and telemedicine. (slvetspecialists.com)
Broome MR, Peterson ME: Use of L - thyroxine supplementation after radioiodine therapy helps blunt the worsening of azotemia in hyperthyroid cats with pre-existing kidney disease. (animalendocrine.com)