Radioactive iodine, given in a capsule or liquid form, is absorbed and concentrated by the thyroid gland. The treatment destroys thyroid tissue but does not harm other tissue in the body.
While radiation can cause thyroid cancer, treatment of hyperthyroidism with radioactive iodine does not increase your chances of getting thyroid cancer.
Radioactive iodine therapy is used to destroy thyroid cells.
Radioactive iodine therapy can be used for thyroid cancer to kill cancer cells that remain after surgery has been done to remove the thyroid gland. It may also be used to treat an overactive thyroid gland (hyperthyroidism).
Radioactive iodine is usually given as a liquid or capsule that is swallowed.
For most people, one dose of radioactive iodine treatment will cure hyperthyroidism. Usually, thyroid hormone levels return to normal in 8 to 12 weeks. In rare cases, the person needs a second or third dose of radioactive iodine.
Some side effects from radioactive iodine treatment include:
If you have Graves' ophthalmopathy, also called thyroid eye disease, it may get worse temporarily after radioactive iodine therapy.
Most people don't feel different after treatment. But a few people may have nausea.
Within a few days after treatment, the radioactive iodine will leave your body in your urine and saliva. How long it takes will depend on your age and on the dose you received. Young people get rid of radioactive iodine faster than older adults. Drink plenty of fluids during this time to help your body get rid of the radioactivity.
Your doctor will give you written instructions. To avoid exposing other people to radioactivity, it is important to follow these carefully. He or she will instruct you on how far to stay away from people, how long you need to sleep alone, and other ways to stay safe. You will be told to avoid close contact, kissing, sex, and sharing cups, dishes, or utensils.
Some general recommendations include:
After treatment, you may have follow-up exams every 4 to 6 weeks to check your thyroid hormone levels.
Watch closely for any changes in your health, and be sure to contact your doctor if:
Radioactive iodine is absorbed and concentrated by the thyroid gland. You get it in liquid or pill form. The radiation will pass out of your body through your urine within days. Until that time, you will give off radiation in your sweat, your saliva, your urine, and anything else that comes out of your body. It is important to avoid exposing other people to the radioactivity from your body.
Your doctor will give you more written instructions. Follow these carefully. The instructions will tell you how far to stay away from people and how long you need to follow precautions. They will list other ways to keep other people safe. They will also tell you when it will be safe to go out, go to work, and do other activities.
Radioactive iodine may be used to treat hyperthyroidism in people who have noncancerous (benign) thyroid nodules that make too much thyroid hormone.
Radioactive iodine is also used if you have your thyroid removed (thyroidectomy) because of thyroid cancer. Radioactive iodine therapy destroys any remaining thyroid tissue or cancer cells that were not removed during surgery.
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