Most people have four parathyroids, and even one parathyroid can produce enough parathyroid hormone to keep the calcium level fine. If, however, all the parathyroid glands are removed, then a serious life-threatening low calcium level can occur, causing tetany, similar to the tetanus that tetanus shots are supposed to prevent. This requires large amounts of lifelong calcium pills and vitamin d.
Answered Apr 10, 2018
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