猫甲状腺功能亢进：最常见的内分泌疾病
甲状腺功能亢进是猫最常见的内分泌疾病之一。了解症状、治疗方案以及如何帮助您的猫过上舒适的生活。
Hyperthyroidism is the most common endocrine disorder in cats, typically affecting cats over 10 years old. An overactive thyroid gland produces excess thyroid hormone, which accelerates metabolism and affects nearly every organ system. The good news: it is very treatable, and most cats make a full recovery with proper treatment. Early detection through regular senior blood panels is key.
- Hyperthyroidism is the most common hormonal disease in cats over 10 years old
- Classic signs: weight loss despite increased appetite, restlessness, vomiting, and increased thirst
- Untreated hyperthyroidism damages the heart, kidneys, and other organs
- Diagnosis is straightforward — blood test showing elevated T4 (thyroid hormone)
- Treatment options: medication (methimazole), radioactive iodine therapy, surgery, or prescription diet
- Radioactive iodine (I-131) is a one-time cure for most cats with hyperthyroidism
Understanding Hyperthyroidism
The thyroid glands (two small glands in the neck) produce hormones that regulate metabolism. In hyperthyroid cats, benign tumors (adenomas) cause overproduction of thyroid hormone. This accelerates metabolism dramatically — causing increased appetite, weight loss, rapid heart rate, high blood pressure, and restlessness. About 98% of cases are benign; only 2% are thyroid cancer.
Symptoms
Classic signs: ravenous appetite with weight loss, restlessness/hyperactivity, vomiting and diarrhea, increased thirst and urination, poor coat condition, rapid heart rate, and sometimes a palpable lump in the neck. Some cats become aggressive or vocalize excessively at night. Because these signs develop gradually, owners often don't notice until the disease is advanced.
Treatment Options
Medication (methimazole/Felimazole): daily pill or transdermal gel applied to the ear. Controls symptoms but doesn't cure the disease. Requires regular blood monitoring. Radioactive iodine (I-131): single injection that destroys overactive thyroid tissue. Cure rate >95%. The gold standard treatment. Requires a short hospital stay at a specialized facility. Surgery: removal of affected thyroid gland. Effective but requires anesthesia. Prescription diet (Hill's y/d): iodine-restricted diet. Effective but limits all other food options.
Kidney Considerations
Hyperthyroidism and kidney disease often coexist in senior cats. Hyperthyroidism can mask kidney disease by increasing blood flow to the kidneys. When hyperthyroidism is treated, underlying kidney disease may become apparent. This is why careful monitoring during treatment is essential — your vet will check kidney values alongside thyroid levels.
- Your senior cat is losing weight despite eating more than usual
- Your cat has become restless, hyperactive, or is vomiting frequently
- Your cat's heart rate seems fast or you notice rapid breathing
- Your senior cat has a lump on the neck
- Your cat is drinking and urinating more than usual
- Your cat is due for a senior wellness blood panel (recommended annually for cats over 10)
Royal Veterinary Center provides comprehensive thyroid care for cats including T4 blood testing, thyroid medication management, and monitoring during treatment. We can refer for radioactive iodine therapy at specialized facilities in the region. Our senior wellness panels include thyroid screening for early detection. Call +853 6677 6611 to schedule a senior cat checkup.
+853 6677 6611