Hyperthyroidism is currently recognized as the most common endocrine disorder in cats. Hyperthyroidism is a condition associated with independent release of thyroid hormones by abnormal thyroid tissue. Treatment for hyperthyroidism is available in a 3 forms: medical, radioactive, or surgical treatment. Medical treatment comes in either a tablet given by mouth daily or cream that is rubbed into the ear daily. This is generally the most cost effective form of treatment and does not require referral. It does require blood tests periodically to make sure that the thyroid hormone levels are stable.