Hypercalcemia: A higher-than-normal level of calcium in the blood. Hypercalcemia can be a result of malignancy, elevated parathyroid gland activity (hyperparathyroidism), or other conditions. It can cause a number of nonspecific symptoms, including loss of appetite, nausea, thirst, fatigue, muscle weakness, restlessness, and confusion. An elevated level of calcium may cause muscle weakness and constipation, affect the conduction of electrical impulses in the heart (heart block), lead to calcium stones (nephrocalcinosis) in the urinary tract, impair kidney function, and interfere with the absorption of iron, predisposing the person to iron deficiency.
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