Radioactive Iodine Ablation (RAI) can cause a feeling of hypERthyroidism within hours of administration. This is due to the increased iodine which fuels the thyroid, and is similar to throwing gasoline on a campfire. It may take weeks or months to begin to feel the results of the destruction of thyroid tissues and the subsequent lowering of thyroid hormones. If you are concerned about your specific situation, seek the advice of your qualified endocrinologist.
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The actual administration of the therapy usually takes about half an hour daily, although radiation is administered for only from one to five minutes at each session