Which patients are at risk for the development of hypercalcemia? Standard Text:

 the patient with hyperparathyroidism

1,2,4,5 -- Patients with malignancy are at risk for development of hypercalcemia due to destruction of bone or the production of hormone-like substances by the malignancy. Lithium and overuse of antacids can result in hypercalcemia. Hypercalcemia can result from hyperparathyroidism which causes release of calcium from the bones, increased calcium absorption in the intestines and retention of calcium by the kidneys. The patient who uses sunscreen to excess is more likely to have a vitamin D deficiency which would result in hypocalcemia.