What is Feline Hyperthyroidism?
Feline hyperthyroidism occurs when the thyroid overproduces hormone. Common in older cats (8-10+ years). Proper treatment extends lifespan.

Hyperthyroidism
Symptoms
- Weight loss despite increased appetite
- Hyperactivity, anxiety
- Rapid heart rate (heart murmur)
- Frequent urination, increased thirst
Diagnosis
Blood tests measure T4 levels. Ultrasound checks thyroid size.
Treatment Options
- Medication (methimazole): Lifelong treatment
- Radioactive iodine: Possible cure (expensive)
- Surgery (thyroidectomy): Alternative option
- Special diet (iodine-restricted food)
Medication Management
Methimazole has side effects (low blood counts, liver damage). Regular blood tests are essential.
Sources & References
- Cornell Feline Health Center - Hyperthyroidism
Early diagnosis and treatment greatly improve quality of life.