Early findings:

Hypercalcemia
Polyuria
Polydipsia
Anorexia
Nausea
Vomitting
Constipation
Muscle weakness
Confusion
Depression
Lethargy

Late findings:

Nephrolithiasis
Nephrocalcinosis
Hypertension
Bone pain
Bone cysts
Arthralgias
Osteitis fibrosa cystica
Pathologic fractures
Band keratopathy