The most common feline endocrine disorder worldwide, it is estimated that over 10% of all senior cats will develop the disorder. Over 95% of affected cats have benign adenomatous hyperplasia of the thyroid gland, affecting either both lobes (70% cases) or one lobe (30% cases).
Common clinical signs include:
- Weight loss
- Cardiac murmur
- Palpable goitre
Hyperthyroidism is the most common glandular disorder in cats. It is most frequently caused by an excessive concentration of circulating thyroxine-a thyroid hormone better known as T4-in the bloodstream.