Radioactive Iodine Treatment for Thyroid Cancer

Radioiodine ¹³¹I is a radioactive isotope of iodine. It is given either in capsule form or liquid form to the patient. Once in the body, ¹³¹I reacts mostly with the thyroid cells as the thyroid hormone produced by our body is the mixture of iodine and tyrosine. It circulates inside our body through the blood, but is not absorbed by the other cells. Hence, radioactive iodine treatment does not harm any part of the patient's body. But it may not be effective for every thyroid cancer patient. You need to first try a small dose of iodine, prescribed by your physician to check whether the thyroid cancer cells are getting destroyed by the iodine dose.

Thyroid cancer is a rare type of cancer caused due to abnormal growth of cells inside the gland. Unfortunately, the exact cause of thyroid cancer is not known, but it can be due to excessive exposure to radiation or because of some uncommon changes in the DNA of your cells. Swelling in the neck is the most common symptom of any type of thyroid cancer. Apart from this, other symptoms are, pain in the ears or neck, a frequent cough that does not develop into cold, difficulty in breathing and trouble swallowing eatables. Sometimes, you may not experience any of the above mentioned symptoms. In such a case, you are told by your physician to test for cancer cells inside your thyroid gland. This includes removing a part of the gland with a needle and then testing it for cancerous cells. If some symptoms of thyroid cancer are observed, then you would be either told to undergo a surgery or a radioactive iodine treatment.

Precautions Before Treatment
There are some precautions that need to be taken around 14 days before you start your treatment. You will mostly be prescribed a low iodine diet. Cherries, strawberries, beet and other pink colored food should be avoided. Sweets or pastries that are pink in color should not be included in your diet. Also, avoid eating sea food, as it is rich in iodine. Eggs, salami and other food items with iodine should be eaten in smaller amounts. Cook food with less salt and then consume. Furthermore, milk and milk products should be consumed in less amounts.

Radioactive Iodine Therapy for Thyroid Cancer
It is generally prescribed if your cancer cells are not completely killed post surgery, or if the thyroid cancer has spread excessively, or has come back after the initial treatment. A general way of treating thyroid cancer is by giving the radioactive iodine in the form of a capsule or liquid. Sometimes, ¹³¹I is injected in the patient's arm. But before this, a total body scan along with some blood tests is taken and then the dosage of ¹³¹I is decided accordingly. If a large dose is prescribed, then you may be hospitalized. You can have any food that is low in iodine one hour before the treatment. After it is given, you will not be allowed to eat or drink for some hours, so as to allow your body to consume the iodine. Drink a lot of juice or water after a few hours, so that the given radioactive iodine can be flushed out of the body. Another body scan is taken, mostly on the third day, to check the decrease of radiation levels in your body and the things around you, if you were hospitalized.

Side Effects of Radioactive Iodine
There are very few side effects which can be avoided if proper care is taken during the treatment

• You might get a sore throat few days after the treatment. This is because of the swelling of the salivary glands by the ¹³¹I. It can be treated by any painkiller.
• If you are given a high dose, then you might vomit.
• You may also sometimes get a headache. Have a painkiller prescribed for headaches in such cases.
• Feeling feverish or developing a mild nausea is also one of the side effects of this treatment for thyroid cancer. Do not eat anything for about 2-3 hours after the iodine is injected in your body.

These side effects are rarely observed, if proper care is taken during and after the treatment.

Precautions After Treatment
After the treatment for thyroid cancer, you need to follow some precautions to avoid the exposure of radiation to others.

• Till the radiation levels come to normal, drink at least 10 glasses of water everyday. This will help the ¹³¹I to urinate out. Also, flush the toilet more than once to minimize the amount of radiation through urine. Also, wash the toilet, bathroom, bathtub, washbasin, shower and sink whenever you use them.
• The patient's clothes, washcloths, towels and linens need to be kept separately and washed properly after each use.
• There are chances of the exposure of radiation by plates and glasses too. Keep a separate set of cutlery for yourself and wash them before and after eating. Eat in paper plates, they are easy to dispose.
• If you plan to cook after your treatment, then do not taste the food. Tell someone else to taste it.
• Your family members can be exposed to the radiation when you are in close contact with them. Therefore, avoid living in close proximity with children and family members. Sleep away from your partner for a few days and also avoid getting intimate with him/her.
• Lastly, wash and dry your hands properly before and after you touch anything in your house. Keep a set of towels for yourself and use them for drying your hands.

This treatment is effective when proper precautions are taken. If low iodine diet is maintained before the treatment, then you can be safe from the complications involved in it.