Hyperthyroidism is the most common endocrine disease in older cats. With proper monitoring and treatment, affected cats can live comfortably for years.
Hyperthyroid cats experience chronic physiological stress including racing heart rate, muscle wasting, and gastrointestinal upset. The condition often goes unrecognized because cats may appear energetic despite suffering. Regular monitoring every 3-6 months after diagnosis is essential because treatment can unmask underlying kidney disease. Pill administration twice daily causes stress for many cats; alternative treatment methods should be discussed with veterinarians. Quality of life assessment should include behavioral indicators beyond basic bloodwork.