Feline hyperthyroidism is the most common endocrine disorder in senior cats and has several treatment options with distinct welfare profiles.
Feline hyperthyroidism management illustrates how treatment choice affects welfare across multiple dimensions. Daily oral medication (methimazole) is inexpensive and controls thyroid hormone levels, but requires twice-daily pilling of a cat that may be difficult to medicate, creating daily stress for both cat and owner. Compliance failure is common and welfare suffers both from inadequate control and from administration stress. Radioactive iodine delivers a single curative treatment but requires 1-2 weeks hospitalisation in a radiation facility, causing acute isolation stress. Surgical thyroidectomy is effective but carries anaesthetic risk and requires experienced surgeons to avoid parathyroid damage. Dietary iodine restriction through prescription food is effective only if the cat eats nothing else — practical compliance is difficult in multi-cat households. The optimal choice depends on individual cat factors, owner circumstances, and concurrent disease status.