Radiation Therapy for Thyroid Cancer
Two kinds of radiation therapy are available for treating thyroid cancer. One is taken delivered internally and the other is delivered externally.
Radioablation Therapy and Radioactive Iodine Therapy
Radioablation therapy or radioactive iodine therapy is used after
This type of therapy is only appropriate for patients with follicular or papillary thyroid cancer; medullary and anaplastic thyroid cancers don’t respond well to radioablation therapy.
Radiation therapy is not useful in thyroid cancers which normally do not concentrate iodide such as in anaplastic or medullary cancers. Pregnant patients should not receive radiation treatment.
This is a very effective way of killing any stray thyroid cancer cells remaining after thyroidectomy, cancerous lymph nodes, or thyroid cancer that has spread elsewhere in the body. Moreover, it is very effective in treating bone pain secondary to bony metastasis.
Side Effects and Possible Complications
With radioablation therapy, you may experience the following unpleasant effects:
- If there are cancer cells elsewhere in your body, these areas may become briefly swollen and painful as the iodine collects in them.
- Nausea and vomiting during the first day or so
- Swelling or pain in your neck
- Dry mouth
- Brief loss of your sense of smell or taste
In addition, men who receive large doses of radioactivity may become
- Depending on the dose of radioactivity that you receive, you may have to be isolated in the hospital for several days to avoid exposing others to radiation.
- Suck on hard candy or chew sugar-free gum to relieve dry mouth.
- Drink a lot of water in the days and weeks following radioablation therapy to more quickly wash the radioactivity out of your bladder.
External Radiation Therapy
External radiation therapy is given to patients who have either inoperable or recurrent thyroid cancer that does not readily take up iodine, or metastasis elsewhere in the body that is not appropriate for treatment with radioactive iodine. It may also be given for palliation—to ease troublesome symptoms, such as difficulty swallowing, blocked airway, metastatic bone pain, and other symptoms.
In external radiation therapy, rays are directed at the tumor from outside the body. External beam radiation may help relieve difficult symptoms.
External radiation therapy can provide symptom relief and may be the only way to slow progression of inoperable tumors, such as anaplastic thyroid cancers.
Side Effects and Possible Complications
With external radiation therapy, you may experience the following unpleasant effects:
- Dry, red, irritated skin
- Difficulty swallowing
- Hoarse voice
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Last reviewed November 2008 by
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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