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Radioactive iodine treatment can affect the bone marrow. This can cause a small drop in the number of blood cells. This usually doesn’t last long and should cause no problems. As well as radioactive iodine you might have external radiotherapy if the cancer has spread to the bones.When is radioactive iodine really necessary?
Radioactive iodine therapy helps people live longer if they have papillary or follicular thyroid cancer (differentiated thyroid cancer) that has spread to the neck or other body parts, and it is now standard practice in such cases.What to expect after radioactive iodine treatment?
Radioactive iodine may also affect a woman’s ovaries, and some women may have irregular periods for up to a year after treatment. Many doctors recommend that women avoid becoming pregnant for 6 months to a year after treatment. No ill effects have been noted in the children born to parents who received radioactive iodine in the past.