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The hormone is thyroxine and the purpose of the thyroid gland is to make, store, and release thyroid hormones into the blood.

It is important to eat iodized salt so as to avoid the occurrence of the disease called goitre and is the major source of iodine.
The disease is goitre and its symptom is the swelling of the neck.

Hope I helped you! :)
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 I have this thyoid problem but fortunately didn't face the goitre problem. :)