Hyperthyroidism is the most common hormonal disorder in older cats. Radioiodine therapy (I-131) offers a curative one-treatment solution, but the required isolation period raises important welfare questions that deserve careful consideration.
The welfare calculus of radioiodine therapy is complex. Hyperthyroidism itself causes chronic suffering - affected cats are in a constant state of metabolic overdrive, with cardiac strain, muscle wasting, and gastrointestinal distress. Treatment offers a cure, but the isolation period presents its own welfare challenges. Cats are social animals (with humans if not other cats), and multi-day isolation in an unfamiliar medical facility without owner contact causes stress. Facilities vary widely: some provide enrichment, hide boxes, and human interaction; others keep cats in bare cages. The welfare benefit of cure typically outweighs isolation stress, but owners should carefully evaluate facility standards before choosing I-131 treatment.