On the other hand, calcitonin is produced by the thyroid gland in response to high serum calcium, so it opposes the action of PTH - therefore promoting bone formation and decreasing bone resorption.
This can happen following a thyroid gland removal surgery when the parathyroids are accidentally taken out too or radiation treatment for cancer of the head or neck.
If calcium levels fall, the four parathyroid glands buried within the thyroid gland release parathyroid hormone which frees up both calcium and phosphate ions from the bones.
Now, we don't fully understand why yet, but if you have something like Graves' disease, your body produces abnormal antibodies that target the cells of your thyroid gland itself.
And so a lot of the isotopes that we as humans are most frightened of, especially iodine, that's the stuff that gets lodged in our thyroid gland and causes cancer, a lot of that has been sort of decaying away.
So-called goiter, which caused a swelling, the thyroid gland gets bigger, and this used to be called Derbyshire neck this unpleasant illness, because it happened in this area of Nottingham and Derbyshire.
In some regions, anywhere from 26% to 70% of school-aged children had the characteristic neck swellings, or goitres, caused by an enlargement of the thyroid gland.