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Elevated concentration of parathyroid hormone. Causes include conditions originating within the parathyroid glands (primary), in response to hypocalcemia and hyperphosphatemia (secondary), and renal disease (tertiary). Characteristics may include polyuria, polydipsia, constipation, lethargy, cognitive dysfunction, hypercalciuria, nephrolithiasis, and bone demineralization or reduced bone mineral density.
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