For those who were wondering about the "massive damage" (taken from the posted link): * Hyperparathyroidism (which could be caused by a parathyroid tumor

For those who were wondering about the "massive damage" (taken from the posted link): * Hyperparathyroidism (which could be caused by a parathyroid tumor) causes dangerously high calcium levels [1] * As a countermeasure, the body effectively lowers vitamin D (vitamin D facilitates calcium absorption) An ignorant doctor may miss the high calcium levels, seeing only low vitamin D, and put you on vitamin D supplements, which will raise your calcium levels again, thus eliminating the body's defenses against hyperparathyroidism. [1] https://en.wikipedia.org/wiki/Hypercalcaemia#Signs_and_symptoms https://en.wikipedia.org/wiki/Hypercalcaemia#Signs_and_sympt...