Hyperthyroidism in Cats: Diagnosis and Treatment Explained

Hyperthyroidism is one of the most common endocrine disorders in older cats. It occurs when the thyroid gland produces too much hormone, speeding up metabolism and affecting nearly every body system. Early detection and proper management can make a significant difference in quality of life.

Symptoms to Watch For

Hyperthyroidism can develop gradually, so owners may miss subtle early signs:

• Weight loss despite a healthy or increased appetite
• Increased thirst and urination
• Hyperactivity, restlessness, or irritability
• Vomiting or diarrhea
• Poor coat condition or excessive shedding

Older cats may also show less obvious changes like hiding more, vocalizing excessively, or developing heart issues.

Diagnosis

Diagnosis typically involves:

• Physical examination: Enlarged thyroid glands may be palpable in some cats.
• Blood tests: T4 hormone levels are measured to confirm hyperthyroidism.
• Additional testing: Bloodwork and imaging to assess heart, liver, and kidney function, which can be affected by the disease.

Treatment Options

Treatment is tailored to each cat and may include:

• Medication: Methimazole helps regulate thyroid hormone production.
• Dietary management: Prescription diets low in iodine can limit hormone production.
• Surgery: Removal of the affected thyroid gland can be done in rare cases.
• Radioactive iodine therapy: A safe, highly effective treatment that can cure the condition in many cases.

Regular monitoring is essential to adjust therapy and prevent complications.

If your cat shows any signs of hyperthyroidism, call us or book an appointment for evaluation and a personalized treatment plan.