Hyperthyroidism is one of the most frequently diagnosed disorders in the geriatric cat. This condition is the result of excess secretion of thyroid hormone which causes an increase in the body’s metabolic rate. In cats, 98% have benign hyperplasia or benign tumor of the thyroid tissue. The remaining 2% have cancer of the thyroid tissue. The disease is most often diagnosed in cats seven years old or older.
Clinical signs include weight loss, increased thirst and urination, increased stool production with possible diarrhea, vomiting, behavioral changes (nervousness, hyperactivity, increased vocalization), cardiac changes, and hypertension. New information suggests that hyperthyroidism will mask early kidney disease. Diagnosis is usually made by measuring the level of thyroid hormone (T4) in the blood. In a small percentage of cases, additional tests may be required. Fortunately, this disease is treatable in most cases either with oral medication (Tapazole), Radioiodine (I-131), or surgery.
Below are links to help you understand the disease, its diagnosis and treatment.
Classic signs of Hyperthyroidism